User`s guide

System Administrator’s Guide – Release 7.2.3.x
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Revised: September 1, 2010
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is not typically checked. However, in some cases, the service provider or proxy may be doing the conversion
automatically so you may want to defeat the Allworx server’s conversion mechanism.
Digits Sent
– This is the number of dialed DTMF digits to be sent to the ITSP when making a call. If the
number specified here is fewer than the number of digits dialed by the user, only the trailing digits are sent.
The default value (all digits) is typical.
Default Language
(Requires the Dual Language Support feature key) – This is the choice of languages that
will be used for Allworx audio messages and greetings that are played for inbound calls through the SIP
Proxy.
Default Auto Attendant
– Select the auto-attendant that should be used when inbound calls from this Proxy
are routed to an Auto Attendant.
Proxy is an Enterprise Server
– This is an advanced feature that allows interfacing to external SIP proxy
services that actually have dial plan knowledge of your local site, but in most cases this feature is not used.
See Section 10.4.3, Enterprise Dialing Feature, below for more information.
Call Routing
– This selection determines how calls received from this proxy are routed inbound to the Allworx
server. This is identical to the manner how all outside lines are configured including analog phone lines and
digital lines.
Advanced Settings
These settings are specific to the ITSP. For instructions on configuring them for Allworx partner ITSPs,
download the ITSP Application Notes from www.allworx.com.
Pad DTMF RTP Packets
– DTMF RTP packets are typically smaller than 64 bytes. Some switches and
routers will discard any UDP packets shorter than 64 bytes. When this box is checked the Allworx will pad the
DTMF packet by expanding the RTP header to make the packet at least 64 bytes long. Typically this
checkbox is not checked.
Enable Early Media
– Some service providers send audio before an outbound call has been answered (using
183 Session Progress in SIP). This can be used to relay announcements (e.g. "Your call can not be
completed as dialed”) or remote ring back tones. When this checkbox is checked, the Allworx will present the
audio to the caller when received. When this checkbox is not checked, the Allworx will ignore the early audio
and generate a ring back tone internally. Typically this checkbox is checked.
Supports Symmetric Response Routing
– Some service providers assist the remote end in NAT traversal by
supporting RFC 3581 Symmetric Response Routing. When this checkbox is checked, a remote handset
behind a NAT firewall will assume the service provider can correctly detect the audio port to send traffic to.
When this checkbox is not checked, the handset needs to be port-forwarded through the NAT firewall, or
must use the Allworx for proxying of audio traffic (see Servers / VoIP Server). Typically this checkbox is not
checked.
Use SIP Diversion for deflected calls
- Some service providers support the SIP "Diversion" header (draft-levy-
diversion-08.txt) to identify the proxy account when transferring or deflecting calls that include Calling Party
information.
Supports SIP REFER
– This selects the method of transferring calls between multiple remote end-points
through the service provider. When this checkbox is checked, SIP REFER is sent to the service provider to
allow them to connect the two end-points within their network without intervention by the Allworx. When this