Grandstream Networks GXP-280 Voice Frames, Per TX, Layer 3 QoS, Layer 2 QoS, No Key Entry, Port

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Voice Frames

This field contains the number of voice frames to be transmitted in a single Ethernet

per TX

packet (be advised the IS limit is based on the maximum size of Ethernet packet is 1500

 

byte (or 120kbps)).

 

When setting this value, be aware of the requested packet time (ptime, used in SDP

 

message) is a result of configuring this parameter. This parameter is associated with the

 

first codec in the above codec Preference List or the actual used payload type

 

negotiated between the 2 conversation parties at run time. E.g., if the first codec is

 

configured as G.723 and the “Voice Frames per TX” is set to 2, then the “ptime” value in

 

the SDP message of an INVITE request will be 60ms because each G.723 voice frame

 

contains 30ms of audio. Similarly, if this field is set to 2 and the first codec is G.729 or

 

G.711 or G.726, then the “ptime” value in the SDP message of an INVITE request will be

 

20ms.

 

If the configured voice frames per TX exceeds the maximum allowed value, the IP phone

 

will use and save the maximum allowed value for the corresponding first codec choice.

 

The maximum value for PCM is 10 (x10ms) frames; for G.726, it is 20 (x10ms) frames;

 

for G.723, it is 32 (x30ms) frames; for G.729/G.728, 64 (x10ms) and 64 (x2.5ms) frames

 

respectively.

 

Please be careful when editing these parameters. Adjusting these parameters will also

 

change the dynamic jitter buffer. The GXP has a patent dynamic jitter buffer handling

 

algorithm. The jitter buffer range is 20 ~ 200 ms.

Grandstream recommends using the default settings provided. Grandstream does not recommend adjusting these parameters if you are an average user. Incorrect settings

will affect the voice quality. Please refer to the Codec FAQ at http://www.grandstream.com/pdf/FAQ-Codec.pdf for more technical detail.

 

Layer 3 QoS

 

This field defines the layer 3 QoS parameter. It is the value used for IP Precedence or

 

 

 

 

Diff-Serv or MPLS. Default value is 48.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Layer 2 QoS

 

This contains the value used for layer 2 VLAN tag. Default setting is blank.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

No Key Entry

 

Default is 4 seconds.

 

 

 

 

Timeout

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Use # as

 

This parameter allows users to configure the “#” key as the “Send” (or “Dial”) key. If set

 

 

Dial Key

 

to “Yes”, the “#” key will immediately send the call.

In this case, this key is essentially

 

 

 

 

equivalent to the “(Re)Dial” key. If set to “No”, the “#” key is included as part of the dial

 

 

 

 

string.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Local RTP port

 

This parameter defines the local RTP-RTCP port pair used to listen and transmit. It is the

 

 

 

 

base RTP port for channel 0. When configured, channel 0 will use this port _value for

 

 

 

 

RTP and the port_value+1 for its RTCP; channel 1 will use port_value+2 for RTP and

 

 

 

 

port_value+3 for its RTCP. The default value is 5004.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Use Random

 

This parameter, when set to “Yes”, will force random generation of both the local SIP

 

 

Port

 

and RTP ports. This is usually necessary when multiple GXPs are behind the same

 

 

 

 

NAT. Default is No.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Keep-alive

 

This parameter specifies how often the GXP sends a blank UDP packet to the SIP

 

 

interval

 

server in order to keep the “hole” on the NAT open. Default is 20 seconds.

 

 

 

 

 

 

 

 

 

 

 

 

 

Use NAT IP

 

NAT IP address used in SIP/SDP message. Default is blank.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Grandstream Networks, Inc.

GXP User Manual

Page 28 of 38

 

 

 

 

Firmware 1.1.6.44

Last Updated: 12/2008

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Contents Page Table of Figures GUI Interface Examples Welcome Installation GXP-2000 w/GXP-Extension Connecting the GXP-2000GXP-Extension Connection plate GXP-2000 Internal Headset Wiring Schema Product Overview GXP Product ModelsGXP Key Features in a Glance GXP Hardware SpecificationsGXP Technical Specifications Audio Features FeaturesUpgrades Server FeaturesLCD Buttons Using the GXP SIP Enterprise PhoneLCD Icons AM PM Line Buttons Multiple SIP Accounts and Lines Handset, Speakerphone and Headset ModeCompleting Calls Speed Dial Making Calls using IP Addresses For exampleReceiving Calls Do Not DisturbCall Waiting/ Call Hold Mute/DeleteVoice Messages Message Waiting Indicator Way ConferencingBusy Lamp Field Initiate a Conference CallGXP Call Features Key Call FeaturesConfiguration Guide Key Pad Configuration MenuConfigure Factory Functions Reboot Exit UpgradeFactory Reset Layer 2 QoS Configure Vlan TagsSIP Access the Web Configuration Menu DefinitionsDevice Configuration Basic Settings Device Configuration StatusEnd User Password IP Address Multi Purpose Key Time Zone Mute Speaker Ringer in Headset Mode Advanced Settings Timeout Use # as Voice FramesPer TX Layer 3 QoSAuthenticate Stun ServerVia Http ServerDownload Application Offhook AutoDial Dtmf Payload Type OnhookDisable Call Waiting Disable CallWaiting Tone Disable Direct Call ModeSIP Account Settings Retry Wait Time SIP T1 Timeout Delayed Call ForwardEnable Call Features Local SIP PortRing Timeout Caller Request TimerCallee Request Timer Force TimerDisable Multiple Media Srtp ModeSpecial Feature Allow Auto Answer bySoftware Upgrade & Customization Web Configuration InterfaceKey Pad Menu No Local Tftp ServerManaging Firmware and Configuration File Download Instructions for local Tftp UpgradeRestore Factory Default Setting Instructions for Restoration

GXP-280 specifications

The Grandstream Networks GXP-280 is a well-regarded model in the realm of VoIP (Voice over Internet Protocol) telephony, designed particularly for small to medium-sized businesses. This feature-rich IP phone is recognized for its reliability, ease of use, and versatile functionalities, making it a preferred choice among business users seeking a robust and effective communication solution.

One of the standout features of the GXP-280 is its support for up to four SIP accounts, enabling users to manage multiple lines simultaneously. This is particularly beneficial for businesses that require efficient call handling across different departments or clients. The phone sports an intuitive LCD display that provides clear visibility of caller information, call status, and feature access, ensuring user-friendly operation.

The GXP-280 is powered by advanced technologies such as HD Voice, which provides crystal-clear audio quality during calls. This clarity is further enhanced by the phone’s wideband audio support, allowing for richer sound reproduction that is crucial for effective communication. The phone is equipped with dual Ethernet ports, one of which supports Power over Ethernet (PoE), simplifying the installation process by allowing power and data to be transmitted through a single cable.

In terms of flexibility and personalization, the GXP-280 comes with programmable soft keys, allowing users to customize their interface to suit their specific workflow preferences. Additionally, the phone includes built-in Bluetooth support, which extends its capabilities to integrate with wireless headsets, enabling hands-free operations.

Security is also a pivotal aspect of the GXP-280, as it features encrypted signaling and media, ensuring that business communications remain secure from potential threats. The device supports standard security protocols such as SRTP and TLS, making it compliant with contemporary security standards.

Moreover, the GXP-280 offers a variety of codec options, including G.722, G.711, and G.729, allowing it to adapt to various network conditions and requirements. Its compatibility with a wide range of SIP platforms adds to its appeal, making deployment in existing infrastructures seamless.

To summarize, the Grandstream Networks GXP-280 is a versatile, reliable, and feature-rich IP phone that stands out for its clarity, flexibility, and security, making it an excellent choice for businesses looking to enhance their communication systems. With its impressive array of functionalities and support for modern technologies, the GXP-280 is a representation of Grandstream's commitment to providing high-quality communication solutions.