Panasonic KX-TDE100 manual Information about IP Telephony Service

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1.1 Information about IP Telephony Service

VoIP communication using the V-SIPGW16 card may deteriorate depending on the network conditions.

DNS (Domain Name System)

A DNS server normally provides the name resolution service for your computer. As domain names are alphabetic, they are easier to remember. The Internet, however, is based on IP addresses. Therefore, every time a domain name is used, a DNS server must translate the name into the corresponding IP address, and vice versa. For example, the domain name www.example.com may be translated to 192.0.34.166. If one DNS server does not know how to translate a particular domain name, it asks another one, and so on, until the correct IP address is returned.

NAT (Network Address Translation) Traversal

When NAT/NAPT (Network Address Port Translation) is enabled, the router translates a local IP address from the PBX into a global IP address. However, the router with NAT enabled does not translate local IP addresses stored in SIP messages into global IP addresses.

Therefore, the address which the SIP Server recognises as the destination IP address to reply to is actually the local IP address of the PBX, not the global IP address of the router. Therefore, if the SIP server receives a SIP message from the PBX and sends a message back to the PBX using the address stored in the SIP message, the packet information will not reach the PBX.

STUN Servers function to solve the global IP address problem under certain NAT conditions, for example, in case of full duplex communication. A STUN Server, used alongside the SIP Server, finds out the global IP address of the router with NAT enabled. With the STUN feature enabled, the packet information sent by the SIP Server is able to "traverse" NAT and reach the PBX.

The settings can be configured to specify whether to enable the NAT Traversal feature for each ISP/ITSP. In addition, the NAT Traversal method can be selected from "STUN" and "Fixed IP Address" (refer to

3.3.1 Main, NAT Traversal).

The V-SIPGW16 card may require the NAT Traversal feature to be enabled to connect to the WAN via a router. The following diagram illustrates how VoIP communication is enabled between the V-SIPGW16 card and the SIP Server (SIP Receiver) via a router with NAT enabled.

Programming Manual for Virtual SIP Trunk Card

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Contents Pure IP-PBX Programming Manual for Virtual SIP Trunk CardTable of Contents Section Overview SIPGW16 Connection Outline Information about IP Telephony ServiceRequirements for Internet Telephony Service Information about IP Telephony Service WAN Port Requirements Important Notice for Subscription and InstallationFirewall Requirements Required Ports for Each ChannelRequired Bandwidth for Each Channel Bandwidth RequirementsRouter Requirements Items Specification SpecificationsSpecifications Preparations for PC Programming Installing and Starting the Maintenance Console Maintenance Console Operating InstructionsInstalling the Maintenance Console When country/area data do not match Installing and Starting the Maintenance Console Under Configuration, click Slot Installing the V-SIPGW16 Card to the PBXProgramming the V-SIPGW16 Card Programming Port Property Accessing Port PropertiesProgramming the V-SIPGW16 Card-Port Property Main Account User Name Authentication IDAuthentication Password Register Sending Interval RegisterRegister Ability 4 NAT Un-Register Ability when port INSRegistrar Server-Name Registrar Server-IP AddressStun Server-Name OptionStun Server-IP Address Stun Server Port NumberSession Refresh Session Timer-Session Expire Timer Session Refresh Session Timer-Session Timer AbilitySession Refresh Session Timer-Refresh Method Proxy-Require OptionFrom Header-User Part Calling PartyHeader Type Called Party Type Voice/FAXPacket Sampling Time G.711µ IP Codec Priority-1st, 2nd, 3rdPacket Sampling Time G.711A Voice Activity Detection for G.711 Packet Sampling Time G.729AFAX Sending Method Maximum Bit RateRTP QoS-ToS Priority 9 RTP/RTCPRTP QoS Ability 10 T.38 FAX Max Datagram FAX Udptl Error Correction RedundancyFAX Udptl Redundancy count for T.30 messages FAX Udptl Redundancy count for dataFAX Rate Management Method 11 T.38 OptionFAX QoS Available FAX QoS-ToS PriorityFAX QoS-ToS Type 12 DSPFAX QoS-DSCP FAX QoS-HEXSupplementary Service Cnip Receive Cnip SendValue Range Programming the V-SIPGW16 Card-Card Property Accessing Card PropertiesCard Property Programming Card PropertyManual Preferred DNS Server IP Address DNS Retry Interval TimerManual Alternate DNS Server IP Address Manual DNS Server Port NumberDNS SRV Record Resolve Ability Programming the V-SIPGW16 Card-Shelf Property Accessing Shelf PropertiesProgramming Shelf Property SIP Client Port NumberNAT Keep Alive Packet Sending Ability NAT Voice RTP UDP Port NoNAT Keep Alive Packet Type NAT Keep Alive Packet Sending IntervalStun Resending Interval Stun External Address Detection Retry CounterSIP Called Party Number Check Ability Symmetric Response Routing AbilitySIP T1 TimerTimer Section Maintenance Importing/Exporting V-SIPGW16 Provider Profiles Configuration ManagementTo import provider profiles To export provider profilesTo transfer trace data to the PC SIPGW16 Protocol TraceTo save trace data to the SD Memory Card SIPGW16 Protocol Trace Index Index Programming Manual for Virtual SIP Trunk Card PSQX5028ZA KK1008TE0
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