User`s guide

Allworx Server Administrator’s Guide Version 7.6
1-866-ALLWORX * 585-421-3850 Page 107
www.allworx.com
Revised: 11/22/13
Supports Symmetric
Response Routing
Some service providers assist the remote end in NAT traversal by supporting
RFC 3581 Symmetric Response Routing. When checking this checkbox, a
remote handset behind a NAT firewall assumes the service provider can
correctly detect the audio port to send traffic. If unchecked, port-forward the
handset through the NAT firewall, or use the Allworx for proxying of audio traffic
(see Servers > VoIP Server). Typically, leave the box unchecked.
Allow SIP P-Asserted-
Identity (SIP Gateway)
The server asserts its identity with enabled proxies as well as proxy asserted
identity from trusted devices to other trusted devices. Options include:
• Enabled (check the box).
• Disabled (leave box blank).
Send SIP Diversion
header (SIP Gateway)
The Allworx server supports the SIP Diversion header. Options include:
• Always: includes the header in all INVITE requests sent to the SIP proxy.
• Never: excludes the header from all requests sent to the SIP proxy.
• On Redirect: adds header only when the server redirects the request.
Obtain DID/DNIS
number from [source]
For inbound calls, where the server gets the DID and DNIS information.
Typically, this is set to [SIP To: header field].
Use [source] in
Request URI of
outbound calls
This defines the username parameter of the SIP Request Uniform Resource
Identifier (URI) for outbound calls to the service provider. Most service providers
expect to have the requested number or ID [dialed number] in this field, but
some require the registered account information [address of record]. Typically
this is set to [dialed number].
Codec Negotiation
Defines the media offered to the proxy when the server initiates INVITE and
re-INVITE requests.
Options include:
• Send No Offer
• G.711, G.729A
• G.729A, G.711
• G.711
* These settings are specific to the ITSP. For instructions on configuring them for Allworx partner ITSPs,
download the ITSP Application Notes from www.allworxportal.com
.
Advanced
Setting*
Description