NAT Traversal

 

This parameter activates the NAT traversal mechanism. It has options: No, STUN,

 

 

 

 

Keep-Alive, UPnP, Auto, VPN.

 

 

 

 

If selecting STUN and a STUN server is also specified, the phone performs

 

 

 

 

according to the STUN client specification. Using this mode, the embedded STUN

 

 

 

 

client detects if and what type of NAT/Firewall configuration is used. If the detected

 

 

 

 

NAT is a Full Cone, Restricted Cone, or a Port-Restricted Cone, the phone will use

 

 

 

 

its mapped public IP address and port in all of its SIP and SDP messages.

 

 

 

 

If selecting Keep-Alive with no specified STUN server, the GXP21xx will periodically

 

 

 

 

(every 20 seconds or so) send a blank UDP packet (with no payload data) to the

 

 

 

 

SIP server to keep the “hole” on the NAT open.

 

 

 

 

 

 

 

 

 

 

 

 

SUBSCRIBE for MWI

 

Default is “No”. When set to “Yes” a SUBSCRIBE for Message Waiting Indication

 

 

 

 

will be sent periodically.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PUBLISH for Presence

 

Enable Presence feature.

 

 

 

 

 

 

 

 

 

 

 

 

Proxy-Require

 

SIP Extension to notify SIP server that the unit is behind the NAT/Firewall.

 

 

 

 

 

 

 

 

 

 

 

 

Voice Mail UserID

 

When configured, user can access messages by pressing “MSG” button. This ID is

 

 

 

 

usually the VM portal access number.

 

 

 

 

 

 

 

 

 

 

 

 

Send DTMF

 

This parameter specifies the mechanism to transmit DTMF digit. There are 3

 

 

 

 

supported modes: in audio which means DTMF is combined in audio signal (not

 

 

 

 

very reliable with low-bit-rate codec), via RTP (RFC2833), or via SIP INFO.

 

 

 

 

 

 

 

 

 

 

 

 

DTMF Payload Type

 

Sends DTMF using RFC2833. The default is 101.

 

 

 

 

 

 

 

 

 

 

 

 

Early Dial

 

Default is “No”. Use only if proxy supports 484 responses.

 

 

 

 

 

 

 

 

 

 

 

 

Dial Plan Prefix

 

Sets the prefix added to each dialed number.

 

 

 

 

 

 

Grandstream Networks, Inc.

GXP21xx User Manual

Page 34 of 41

 

Firmware version: 1.0.1.66

Last Updated: 05/2011

Page 35
Image 35
Grandstream Networks GXP21XX NAT Traversal, Subscribe for MWI, Publish for Presence, Proxy-Require, Voice Mail UserID

GXP21XX specifications

Grandstream Networks GXP21XX series is a line of high-performance VoIP (Voice over Internet Protocol) desktop IP phones designed to deliver a versatile communication experience for both small and medium-sized businesses as well as large enterprises. The GXP21XX series encompasses a range of models, including the GXP2130, GXP2140, and GXP2160, each offering distinct features and capabilities to cater to various user needs.

One of the main features of the GXP21XX series is its support for high-definition (HD) voice technology. This ensures crystal-clear audio quality during calls, enhancing the overall communication experience. HD voice is complemented by advanced echo cancellation and noise reduction technologies, making it easy to communicate even in bustling environments.

The GXP21XX series boasts a user-friendly interface supported by a large LCD display, which is designed for easy navigation and menu access. These phones offer programmable keys, allowing users to customize their devices for quick access to frequently used features, including speed dials and call transfers.

In terms of connectivity, the GXP21XX series is equipped with dual Gigabit Ethernet ports, facilitating high-speed connections to both the local network and the internet. This allows for seamless integration into existing infrastructures without compromising call quality or network performance. Additionally, the phones support Power over Ethernet (PoE), enabling straightforward installation without the need for additional power sources.

The phones come pre-loaded with a multitude of voice codecs, including G.722, G.711, and G.729, offering flexibility to adapt to various network conditions. Users can enjoy secure communication through built-in security encryption features, such as TLS and SRTP, ensuring sensitive data remains safeguarded.

Moreover, the GXP21XX series incorporates advanced functionalities, such as support for up to six SIP accounts, call presence, and a full-duplex speakerphone, making them ideal for multi-tasking and collaborative environments. Interoperability with major VoIP platforms enhances compatibility, ensuring that users can easily integrate their devices into diverse communication systems.

In conclusion, the Grandstream GXP21XX series stands out as a robust and feature-rich solution for VoIP communication. With its focus on HD voice quality, user-friendly interface, and advanced connectivity options, it provides a comprehensive tool for enhancing both individual and team productivity. Whether used in an office environment or for remote work, the GXP21XX series delivers reliability and performance tailored to the needs of today’s business communication landscape.