SIP IP Phone | Aastra Telecom 57I C53I instruction

53i, 55i, 57i, 57i CT

SIP IP PHONE

41-001160-00 Rev 01

Administrator Guide

Release 2.0

Image 1

Aastra Telecom 57I C53I manual SIP IP Phone

Contents

SIP IP Phone Page Software License Agreement Page Contents Contents Chapter Operational IP Phone Features Chapter Advanced IP Phone Operational Features Chapter Firmware Upgrade 105 Appendix B Configuration Server Setup Appendix E Sample BLF Softkey Settings Introduction About this guideAudience Other Documentation For Go to Chapters and appendixes in this guidePage Topics About this chapterTopic IP Phone Models Softkeys Feature Keys on HandsetDescription References For 55i, 57i, and 57i CT For 57i, and 57i CT 536EM Expansion ModuleReference Installation Considerations Firmware Installation Information Https Hypertext Transfer Protocol over Secure Socket Layer Installation Requirements Reference Configuration Server Requirement IP Phone Associated Model Firmware Firmware and Configuration Files Configuration Methods Configuration File Precedence Step Action Installing the Firmware/Configuration FilesPage Configuration Interface Methods Speakerphone/Headset Key IP Phone UI IP Phone UI Options Key Options Key 53i 55i 57i CT Handset 57i/57i CT From the 53i, 55i, or 57i/57i CT Using the Options KeyFrom the 57i CT handset HTTP/HTTPS Support Aastra Web UI Https Client HTTP/HTTPS Client and Server SupportHttps Server Using Https via the Aastra Web UI Use the following procedure to access the Aastra Web UI Accessing the Aastra Web UI Configuration Interface Methods Operation Status Advanced Settings Basic Settings Firmware Update To disable the Aastra Web UITroubleshooting Enabling/Disabling the Aastra Web UI Administrator Options IP Phone Administrator Guide About this chapter Phone Status-Factory Default Network SIP Settings Reference Administrator Level OptionsIP Phone UI Options Restore to Factory Defaults Configuration File OptionsAastra Web UI Options Using the Configuration Files Phone Status via IP Phone UI Phone StatusPhone Status Screen for 53i Phone Phone Status Screen for 55i, 57i, and 57i CT Phones Network Port 1 All Defaults Config DefaultNetwork Port 2 Firmware Version Network Attributes Phone Status via Aastra Web UIHardware Information Firmware Information Factory Default Feature Basic Preferences Aastra Web UI Key Mapping Incoming/Outgoing Intercom CallsPriority Alerting Directed Call Pickup Network Basic Network SettingsIP Address Subnet Mask Advanced Network Settings Type of Service ToS, Dscp Basic SIP Authentication Settings SIP Settings Basic SIP Network Settings Advanced SIP Settings Timer 1 and Timer Session TimerTransaction timer The amount of time, Registration Failed Retry Timer RTP Settings IP Phone Available Model Line Settings Additional Softkeys IP Phone Model Softkeys/Programmable KeysModule BLF Configuration Server Settings Time 24-hour ModeXML Push Server List Firmware Update Features Administrator Options Configuring the IP Phones Configuring the IP Overview Dhcp Basic Network Settings IP Phone UI Configuring Dhcp Aastra Web UI Configuring Network Settings Manually Configuring Auto-negotiation Configuring Ethernet Ports 0 and 1 NegotiationHalf-Duplex 10Mbps or 100Mbps Default is FullDuplex 10Mbps Configuring Ethernet Ports 0Full-Duplex 10Mbps or 100Mbps Default is AutoNegotiation Configuring Default is Auto Negotiation Default is Full Duplex, 10MbpsSelect Operation-Reset and click Configuring the Configuration Server Protocol Configuration Server ProtocolSelect Download Protocol Select Use TFTP, Use FTP, Use HTTP, or Https Select Primary Tftp Select FTP PasswordSelect FTP Server Select FTP Username Select Download Path Select Http Client Select Download Server Step Action Click on Advanced Settings-Configuration Server Configuring the IP Phones Network Address Translation NAT Advanced Network Settings Nortel Proxy/Registrar NAT router configurationSBC or ALG proxy/registrar Other proxy/registrars Select Network Settings Configuring Nortel NAT optionalSelect NAT Enabled Nortel Networks NAT ConfiguringtheIPPhones Select NAT Settings Configuring NAT Address and Port optionalSelect NAT SIP Port Aastra Web UI Https Client/Server Configuration Select Network Select Https -Client Method Configuring Https Client and Server SettingsTSL Select Phone Status Aastra Web UI Select Operation-Reset and click Upnp manager Upnp gateway Sip nat rtp port Universal Plug and Play UPnP for remote phones Select Network Configuring UPnP optional PhonesIPtheConfiguring Virtual LAN optional Configuring the IP Phones Dscp Range/VLAN Priority Mapping Dscp Range/VLAN Priority Configuring Type of Service ToS/DSCP optional Select Network Select Type of Service Configuring the IP Phones Configuring Vlan optional To set Vlan ID and priority for Port Select PriorityTo set Vlan ID and priority for Port 1 passthrough port Select Passthrough Configuring the IP Phones Step Action Click on Advanced Settings-Network-VLAN Click To save your changes Network Time Servers Configuring NTP Servers optionalSelect Time and Date Select Time Server Configuring Configuration File Parameters Aastra Web UI Parameters Session Initiation Protocol SIP SettingsSIP Global Authentication Parameters SIP Global Parameters SIP Per-Line Parameters SIP Per-Line Authentication Parameters SIP Precedence Example How it Works Backup Proxy/Registrar SupportSIP Server SRV Lookup Configuring Basic SIP Settings optonal Phones Select SIP Settings Configuring the IP Phones To configure SIP authentication settings To configure SIP network settings To save your changes Configuring Advanced SIP Settings optional Configuring the IP Phones Step Phones RTP Port Real-time Transport Protocol RTP SettingsBasic Codecs Bit Rate Algorithm Packetizatio Silence Time Suppression Default Codec Settings Customized Codec Preference List Customized Codec SettingsAttribute Value Dtmf Method Out-of-Band DtmfSilence Suppression Configuring RTP Features Enter an RTP Port Base in the RTP Port field. Default is Line N Phones Operational IP Phone Features Features Operational Features Missed Calls Indicator Feature Description Do Not Disturb DNDXML Customized Services Adjustments Stuttered Dial Tone Feature Description Priority AlertingCall Waiting Tone Language Procedures User PasswordsSelect User Password Phone Click on Operation-User Password Procedure Administrator Passwords Locking/Unlocking a Phone Locking and Unlocking the PhoneLock the phone Unlock the phone Click on Operation-Phone Lock Resetting a User Password Emergency Number Description Defining an Emergency Dial Plan Operational IP Phone Features Time and Date Feature Method of configurationSet Time and Time Format Set Time Zone Set Date and Date Format16 For Set Daylight Savings Time Click on Basic Settings-Preferences-Time and Date SettingSelect Daylight Savings 12h Click on Operation-Reset Hard Keys Redial disabled Conference disabled Call transfer disabledEnabling/Disabling Redial, Xfer, and Conf Keys Mapping Redial and Conf Keys as Speedials Click on Basic Settings-Preferences Using Redial Key for Last Number Redial Softkeys 55i, 57i, 57i CT Softkeys/Programmable Keys/Feature KeysIP Phone Additional Softkeys Programmable Lines Handset Keys Operational IP Phone Features Operational IP Phone Features State-Based Softkeys 55i, 57i, 57i CT only Softkey Type Default States SoftkeyN states Softkey Idle Connected Configuration Example Model 536EM Programmable Keys 53i For models with softkeys Configuring Softkeys and Programmable KeysClick on Operation-Softkeys and XML 55i, 57i, 57i CT Screens Click on Operation-Reset 57i Cordless CT Feature Keys Feature Key Programming Guidelines List empty Use web page to configure Configuring Handset Feature Keys Click on Operation-Handset Keys Locking IP Phone Keys FeaturekeyN lockedTopsoftkeyN locked PrgkeyN locked Locking the IP Phone Keys Suppressing Dtmf Playback Configuring Suppression of Dtmf Playback Operational Click on Basic Settings-Preferences-General Display Dtmf Digits Configuring Display Dtmf Digits Operational Example Busy Lamp Field BLF BLF\List Setting BroadSoft BLF Configuration Asterisk BLF Configuration Click on Operation-Programmable Keys Configuring BLFs Operational IP Phone Features On the 57i/57iCT For the 55i, 57i, and 57i CT softkeys BLF Subscription Period Configuring BLF Subscription Period Features Done Directed Call Pickup BLF or XML Call Interception Playing a Ring Splash Enabling/Disabling Directed Call Pickup Operational IP Phone Features Configuring BLF/BLF List for Directed Call Pickup Operational IP Phone Features Operational IP Phone Features Operational IP Phone Features On the 57i/57iCT For the 55i, 57i, and 57i CT softkeys Configuring XML for Directed Call Pickup Operational IP Phone Features Click on Operation-Programmable Keys Operational IP Phone Features On the 57i/57iCT For the 55i, 57i, and 57i CT softkeys Do Not Disturb DND Configuring DND Operational Bridged Line Appearance BLA 57i/57i CT/53i only Line Mode Phone Number BLA Number Configuring BLAGlobal BLA IP Phone Model Possible # of BLA Lines For Sylantro Server Per-Line BLA Configuring Global BLA For global configuration of BLA Click on Advanced Settings-Line N For per-line configuration of BLA Park Calls/Pick Up Parked Calls Using a BLA Line on the IP Phone Park/Pickup Call Server Configuration Values Park/Pickup Static Configuration 57i/57i CT only 57i/57i CT only Configuring Park /Pickup using Static Configuration Park/Pickup Programmable Configuration On 57i/57i CT Server Park Configuration Pickup Configuration Programmable Configuration Using Configuration FilesModel 57i/480 CT Examples Model 53i Examples Programmable Configuration Using the Aastra Web UI For the 57i/57i CT Operational IP Phone Features For the 57i CT Handset For Click on Operation-Programmable Keys i Screen Operational IP Phone Features Parking a Call Using the Park Call/Pickup Parked Call FeaturePicking up a Parked Call Last Call Return lcr Sylantro Servers only Configuring Last Call ReturnHow it works Operational IP Phone Features For the 57i CT Handset For Call Forwarding Call forward disabled Enabling/Disabling the Ability to Configure Call ForwardingIP Phone Model Available Lines for Call Forwarding Configuring Call Forwarding Configuration Method for Call ForwardingFor global configuration of call fowarding For 55i/57i/57i CT For 55i/57i/57i CT Click on Basic Settings-Call Forward For per-line configuration of call fowarding Callers List Services menu onCallers List key is under Operational IP Phone Features Using the Callers List Callers list disabledEnabling/Disabling Callers List For the 55i, 57i, and 57i CT For Click on Operation-Directory Downloading the Callers List Enabling/Disabling Missed Calls Indicator Missed Calls IndicatorMissed calls indicator disabled Accessing and Clearing Missed Calls Directory key is under Directory ListDirectory List Capabilities Administrator/User Functions for Directory List 41-001160-00, Rev 01 Release 105 Enabling/Disabling Directory List Directory disabled Character Description Server to IP Phone Download Directory List Limitations Server to IP Phone Download BehaviorDirectory List Limitations Using the Directory List For the 57i CT Features Downloading from the IP Phone to the Server Downloading from the Server to the IP Phone FeaturesPhoneIP Sip lineN vmail Voicemail 55i, 57i, and 57i CT only Sip line1 vmail *97 Sip line2 vmail *95 Using Voicemail 57i57i CT only Creating Customized XML Services on the IP Phones XML Customized Services XML Object Description AastraIPPhoneDirectory AastraIPPhoneConfigurationAastraIPPhoneStatus AastraIPPhoneExecute Status Scroll Delay seconds Web UI Xml status scroll delay config filesTimeout CancelAction Enabling/Disabling a Beep for Status Message Displays Status Scroll Delay seconds via the Aastra Web UI Scroll Delay Option for Status MessagesXML Configuration Push from the Server Xml application URI Xml application title Configuring the Phone to use XMLXML Push Requests Configuring for XML on the IP Phone Example Configuration of XML application Aastra Web UI Restart Phone field click 41-001160-00, Rev 01 Release 125 Using the XML Customized Service For the 55i/57i/57i CT Select Custom Features XML Action URIs You dial out the number 5551212, the phone executes a GET on Configuring XML Action URIs Click on Advanced Settings-Action URI Features Http//10.50.10.140/outgoing.php?number=$$REMOTENUMBER$$ XML Softkey URI Configuring XML Softkey URIs Http//10.50.10.140/script.pl?name=$$SIPUSERNAME$$ Aastra Click on Operation-Programmable Keys 53i Screen SIP Local Dial Plan Symbol Description Prefix Dialing Dial Plan Example SIP Dial Plan Terminator Example Configuring the SIP Local Dial Plan Optional for all models Auto-Answer Incoming/Outgoing Intercom with Auto-AnswerOutgoing Intercom Calls 55i, 57i and 57i CT only Incoming Intercom Calls Configuring Intercom Calls and Auto-Answer Outgoing intercom settings 55i, 57i anc 57i CT only Incoming intercom settings Parameter Description Headset tx gain Audio Transmit and Receive Gain AdjustmentsHeadset sidetone gain Handset tx gain Audio mode Configuring Audio Transmit and Receive Gain AdjustmentsParameter Description Handsfree tx gain Configuration Method Valid Values Default Value Ring Tone Settings TableRing Tones and Tone Sets Ring Tones Phone Features Ring Tone Sets For global configuration only Configuring Ring Tones and Tone SetsSelect Set Ring Tone For per-line configuration For global configuration How Priority Alerting Works Priority AlertingAsterisk/Broadworks Sesrver Ring Tone Keywords Sylantro Sesrver Ring Tone Keywords Ring Tone PatternsCall Criteria Bellcore Tones Call criteria Bellcore tones for each call criteria Ring Tone Pattern Sylantro Servers Duration Bellcore Tone Pattern Cadence Standard Minimum Nominal MaximumBellcore-dr2 Bellcore-dr3 Call Waiting Tones For Sylantro Servers Configuring Priority Alerting Select a ring tone pattern for each of the following fields Stuttered Dial Tone Configuring Stuttered Dial Tone 41-001160-00, Rev 01 Release 161 Call Waiting Tone Configuring Call Waiting Tone 41-001160-00, Rev 01 Release 163 Language Loading Language Packs via the Configuration File mac.cfgLoading Language Packs 41-001160-00, Rev 01 Release 165 Loading Language Packs via the Aastra Web UI Specifying the Language to Use Press on the phone to enter the Options List Select Language Loading the Lanaguage Pack Click on Basic Settings-Preferences-Language SettingsSpecifying the Language to Use in the Aastra Web UI Supports the following languages Advanced Operational Features Advanced Operational Features MAC Address/Line Number in Register Messages Configuring the MAC address/Line Number in Register MessageSip send mac Sip send line Advanced SIP Message Sequence for Blind Transfer Configuring SIP Message Sequence for Blind Transfer Sip update callerid Update Caller ID During a CallConfiguring Update Caller ID During a Call Force web recovery mode disabled Boot Sequence Recovery ModeMax boot count Configuring Boot Sequence Recovery Mode Auto-discovery Using mDNS Single Call Restriction 57i CT only Configuring Single Call Restriction FeaturesOperational Encryption and the IP Phone Encryption and the IP Phone Configuration File Encryption Method To encrypt the IP phone configuration files Procedure to Encrypt/Decrypt Configuration Files Example \ anacrypt Page Firmware Upgrade Upgrading the Firmware Manual Firmware Update Tftp only Step Action Click on Advanced Settings-Firmware Update Select Phone Status Select Restart Phone Manual Firmware and Configuration File Update Step Action Click on Operation-Reset Mode Time Automatic Update auto-resyncAuto-resync mode Auto-resync time Configuring Automatic Update Select the auto-resync mode from the Mode field Reference Page Troubleshooting Log Settings Troubleshooting Module Settings Get local.cfg Get server.cfg Show task and Stack Status Support Information Performing Troubleshooting Tasks To set log settings Step Action Click on Advanced Settings-Troubleshooting To perform support tasks To set blog modulesLocal.cfg field Get server.cfg field Why does my phone display Application missing? Troubleshooting Solutions Why does my phone display Bad Encrypted Config? Why does my phone display the No Service message?Reason Fix Troubleshooting How do I restart the IP phone? Click Click OK at the confirmation prompt To restore all factory defaults How do I set the IP phone to factory default?For 55i/57i/57i CT Press Default Restore to Factory Defaults field, click Remove Local Configuration Settings field, click Step Action Click on Operation-User Password How to reset a user’s password? Troubleshooting Page About this appendix Appendix a IP Phone Administrator Guide About this appendix Appendix Setting Parameters in Configuration Files Operational, Basic, and Advanced Parameters Network Settings Subnet mask Parameter Aastra Web UI Parameter Configuration Files Password SettingsParameter ethernet port Range Example Emergency Dial Plan Settings Default Value Range Aastra Web UI Settings Download protocol Parameter alternate tftp server Description Format Default Value Range Example IP phone UI Ftp server Parameter http server Https server Parameter auto resync mode Auto resync time Network Address Translation NAT Settings Sip nortel nat timer Https Client and Server Settings Https block http post xml UPnP Settings Sip nat rtp port Virtual Local Area Network Vlan Settings Dscp Priority Priority non-ip Type of Service ToS/DSCP Settings Time Server Settings Parameter time server2 Time and Date Settings Dst config Time Zone Name Time Zone Code Time Zone Name/Time Zone Code Table NST HKS PES VA-Vatican Range For 55i/57i/57i CT SIP Local Dial Plan SettingsFor 1X+#,9 Parameter sip dial plan Sip dial plan terminator SIP Global Authentication Settings SIP Basic, Global Settings Sip display name Sip bla number SIP Global Network Settings Sip backup proxy ip Sip outbound proxy port Sip registrar port Sip backup registrar port SIP Per-Line Authentication Settings SIP Basic, Per-Line Settings Sip lineN display name Sip lineN password Sip lineN bla number Parameter SIP Per-Line Network Settings Sip linex backup proxy ip Sip lineN outbound proxy port Sip lineN registrar port Sip linex backup registrar port Period Advanced SIP Settings Sip session timer Description Format Default Value Range Example Parameter Parameter sip T2 timerDescription Format Default Value Range Example Sip transport protocol Sip registration timeout retry RTP, Codec, Dtmf Global Settings Silsupp Payload Dtmf Per-Line Settings Silence Suppression Settings Voicemail Settings Directory Settings Call Forward Settings Callers List Settings Missed Calls Indicator Settings XML Settings Xml application post list Xml status scroll delay Action URI Settings Action uri incoming Action uri offhook Range Aastra Web UI & IP Phone UI Ring Tone and Tone Set Global Settings Ring Tone Per-Line Settings Call Waiting Tone Setting Stuttered Dial Tone Setting For Sylantro Server only Priority Alert Settings Alert community Example Parameter alert community Web UI Alert external Parameter alert group Alert priority Configuration File Language Settings Langfr-ca.txt Langes.txt Langde.txt Langit.txt Language Pack Settings Country Codes from Standard ISO Language Codes from Standard ISOLanguage Language Code Country Country Code Appendix Denmark Operational, Basic, and Advanced Parameters Macao Operational, Basic, and Advanced Parameters Appendix a Appendix Suppress Dtmf Playback Setting Display Dtmf Digits Setting Outgoing Intercom Settings Intercom and Auto-Answer SettingsDefault Value For Aastra Web UI For Configuration Files Sip intercom prefix code Auto-Answer Setting Incoming Intercom Setting Audio Transmit and Receive Gain Adjustment Settings Handset sidetone gain Handsfree tx gain Directed Call Pickup BLF or XML Call Interception Settings BLF Subscription Period Settings Hard Key Parameters Hard Key Parameters Available Model Additional Softkeys Programmable Lines Handset Bottom Softkeys Station Up to Softkey Settings for 55i, 57i, 57i CT Accessing the Callers List SoftkeyN label SoftkeyN value SoftkeyN line Directory, Callers List, Intercom, Services, empty Default Value For softkey type NoneFor softkey type Flash For softkey type Sprecode, Park Outgoing Incoming Programmable Key Settings for 53i Dnd do not disturb in the Aastra Web UI PrgkeyN value PrgkeyN line Top Softkey Settings for 57i and 57i CT Topsoftkey1 type line TopsoftkeyN label TopsoftkeyN value TopsoftkeyN line Handset Feature Key Settings for the 57i CT FeaturekeyN label ExpmodX keyN type ExpmodX keyN value ExpmodX keyN line Locking Softkeys and Programmable Keys PrgkeyN locked ExpmodX key N locked MAC Address/Line Number Advanced Operational Parameters Advanced Operational Parameters Blind Transfer Setting Update Caller ID Setting Single Call Restriction Log Settings Troubleshooting Parameters Troubleshooting Parameters 140 Appendix B Tftp Server Set-up Configuration Server Protocol Setup Configuration Server Protocol Setup Page Appendix C IP Phone at the Asterisk IP PBX Name/username Host Mask Port Exten 1234,1,DialSIP/phone1,20Phone1/phone1192.168.1.1D 255.255.255.255 5060 Unmonitored Page Appendix D 57i Sample Configuration File Sample Configuration Files Sample Configuration Files # Time Server Settings ## ===================== # Configuration Server Settings ## = = = = = = = = = = = = = = = Previous expression # General SIP Settings # = = = = = = = = = = = # Per-line SIP Settings # ====================== Sip line3 vmail *78 # Speed Dials # Phone Model 57iCT 57i CT Sample Configuration File # Dhcp Setting # ============ # Network Settings # ================ # Time Server Settings # ==================== # ============================= Appendix Previous expression # General SIP Settings # ==================== # Per-line SIP Settings # ===================== # Softkey Settings # ================ # Speed Dials # DND Key softkey4 type dnd softkey4 label DND #Takes an Appendix D Appendix D Appendix D Appendix D 53i Sample Configuration File # Dhcp Setting # ============= # Time Server Settings # ===================== Appendix D # Additional Network Settings # ============================ Appendix D Appendix Appendix D Previous expression # General SIP Settings # ====================== # Per-line SIP Settings # ======================= # Programmable Key Settings # =========================== Prgkey Value Page Appendix E 57i and 57i CT Configuration Parameters for Asterisk BLF Sample BLF Softkey Settings53i Configuration Parameters for Asterisk BLF Asterisk BLF BroadSoft BroadWorks BLF 53i Configuration Parameters for Broadsoft BroadWorks BLFPage Appendix F Multiple Proxy Server Configuration Multiple Proxy Server Configuration Page Appendix G XML Image Objects 55i, 57i/57i CT only Overview How to Create an XML ApplicationXML format Character Description Escape Sequence Creating XML Objects Existing Text Menu Input Action Keys Creating Custom SoftkeysSelect Exit Dial Submit Backspace Nextspace Dot ChangeMode Implementation Text Menu Object Menu Screens XML Screen Example Text Screen Object Text Screens Text Screen Format Object for Text Screens AastraIPPhoneFormattedTextScreen Structure Line of static text Line of static text Implementation IP Addresss UserInput Object User Input Screens XML Description Proxy Server Server IP Backspace Dot Cancel Done Implementation Number Proxy Port Backspace Cancel Done Implementation String XML Examples TimeUS TimeInt US Date Int Date US Time Enter Current Time 120000am Cancel Done US Date Enter Birthday 12/22/1980 Cancel Done Directory Object Directory List Screen 57i only XML Example AastraIPPhoneStatus Structure Status Message Object Idle Screen XML Examples Using the Reset Command Execute Commands Object for executing XML commandsAastraIPPhoneExecute Object Structure Using the NoOp Command AastraIPPhoneConfiguration Object Structure XML Example Dynamic Configuration Parameters Dynamic Configuration Parameters Appendix G XML Image Objects 55i, 57i/57i CT only Done VerticalAlign HorizontalAlign Height Width AastraIPPhoneImageScreen Object Image AastraIPPhoneImageMenu AastraIPPhoneImageMenu #Weather AastraIPPhoneTextMenu Icon Menu Done Using the IconList SoftKey index = 4 icon=2 URI Name Displays this IP Phone Internal Icon Images ArrowUp Attributes/Options to Use with XML Objects XsAastraIPPhoneFormattedTextScreen Timeout= 30 default = Timeout Attribute Configurable via XML objects only LockIn Attribute Configurable via XML objects only CancelAction Attribute configurable via XML objects only Post / HTTP/1.1 Http Post Appendix G Http Refresh Header Refresh Setting Format XML Schema XML Schema FileHttp Language Header Appendix G Appendix G Appendix G Page Exclusions Limited Warranty After Warranty Service Warranty Repair Services Index Index-2 41-001160-00, Rev 01 Release Index-3 Index-4 41-001160-00, Rev 01 Release Index-5 Index-6 Page SIP IP Phone Administrator Guide