User`s guide

Allworx Server Administrator’s Guide Version 7.6
Page 108 1-866-ALLWORX * 585-421-3850
www.allworx.com
Revised: 11/22/13
VoIP Setting* Description
Force Remote Phone
audio through server
A NAT traversal aid for remote phones that are calling other Internet devices
(ITSPs, other remote phones). This setting only applies to:
• WAN-to-WAN calls.
• Remote phones behind a NAT/Firewall.
• Remote phones that use RFC 3581 “Symmetric Response Routing (rport)” for
NAT traversal.
Note: The ITSP may require enabling this feature.
When enabled:
• The server proxies the RTP packets for the end-points in the call.
• Uses twice the bandwidth per call.
•
When disabled:
• The RTP of the call does not involved the server.
• Uses no bandwidth in the WAN-to-WAN calls.
• Port-forward remote phones through any NAT/Firewalls to use Internet VoIP
services.
RTP DTMF Payload
Use for the SIP INVITE messages when placing calls. The typical value is 96.
Some ITSPs require other values (e.g., 101). An incorrect setting of this
parameter results in outbound calls not being able to navigate external Auto
Attendants. If SIP trunks from two different ITSPs are on the same system and
the ITSPs require different values, then set the value per the ITSP requirements
for the SIP trunk used most for outbound calls. The other SIP trunk may
experience the Auto Attendant problem. Also, it may not be possible to transfer
calls between the trunks.
* Check the settings on the SIP Proxy page and the Server > VoIP page. Some of these settings exist on
both pages and need coordination between the two pages.
Many parameters associated with SIP Gateways are the same as their counterpart under SIP Proxies.
The 6x12 servers do not support SIP Gateways.
Gateway uses SIP
Registration
If the gateway supports registration, select this option. Assign an arbitrary Login
ID and Password for the gateway to use to register with Allworx. Use this
preferred configuration, especially if the gateway uses DHCP to obtain its IP
address so that the Allworx server always knows how to contact the gateway for
outbound calls.
Gateway uses Static IP
Address
Used when the gateway does not support registration or if not authenticating the
gateway. Contacting the gateway through this mechanism requires the gateway
to have a static IP address. The system does not enable DNS names for security
reasons.
Prefix String (Gateway
only)
Define the DTMF digits pre-pended to the dialed number string when placing
outbound calls through the gateway (e.g., ‘9’ for dialing through another SIP
PBX).