Field
Description
Outbound routegroup
Select a routegroup to associate routes with this trunk.
Outbound calls match included route patterns could employ
this trunk to hop onto a remote SIP domain.
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There may not be appropriate routegroup to select initially.
One can come back later to revise it once the expected
routegroup has been added.
DID of extension
When enabled DID, choose an extension to be an
unconditional destination for incoming calls to this trunk. The
number of the SIP trunk is therefore regarded as the direct
line number of the extension.
Language
Preferred language for system instructions heard from the
trunk.
Usergroup of privilege
When disabled DID, select a usergroup whose reachability to
other usergroups and trunks will be used as the privilege of
inbound calls from this trunk.
)
There may not be appropriate usergroups to select initially.
One can come back later once the expected usergroup has
been added.
Disable NAT Traversal
Respond with the proxy based on IP addresses given in the
SIP messages instead of exploiting the received source IP
address for NAT traversal.
DTMF Mode
Choose preferred DTMF mode for this trunk. Currently
supported types include RFC2833, SIP INFO, and in-band
tone. It must match configuration on the server side.
Try peer-to-peer RTP
If checked, IP PBX will attempt to notify the two peers in a
conversation to try peer-to-peer RTP transmission. This is
suggested as long as phone and ITSP side support INVITE or
UPDATE method during a connected call to save the
resource of IP PBX. However, only SIP INFO DTMF mode
should enable this since other DTMF modes require IP PBX
being RTP relay server to support in-line transfer.
Bandwidth sensitive
Indicate the trunk is over a bandwidth-sensitive link, e.g.
across Internet. If checked, a limit must be specified for call
admission.
