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Cisco Unified Communications Manager Administration Guide
OL-18611-01
Chapter 92 Trunk Configuration
Trunk Configuration Settings
Media Termination Point
Required
You can configure Cisco Unified Communications Manager SIP
trunks to always use an MTP. Check this check box to provide media
channel information in the outgoing INVITE request. When this
check box is checked, all media channels must terminate and
reoriginate on the MTP device. If you uncheck the check box, the
Cisco Unified Communications Manager can decide whether calls
are to go through the MTP device or be connected directly between
the endpoints.
Note If check box remains unchecked (default case), Cisco
Unified Communications Manager will attempt to
dynamically allocate an MTP if the DTMF methods for the
call legs are not compatible.
For example, existing phones that run SCCP support only
out-of-band DTMF, and existing phones that run SIP support
RFC2833. Because the DTMF methods are not identical, the Cisco
Unified Communications Manager dynamically allocates an MTP.
If, however, a new phone that runs SCCP, which supports RFC2833
and out-of-band, calls an existing phone that runs SIP, Cisco Unified
Communications Manager does not allocate an MTP because both
phones support RFC2833. So, by having the same type of DTMF
method supported on each phone, no need exists for MTP.
Retry Video Call as Audio This check box pertains to outgoing SIP trunk calls and does not
impact incoming calls.
By default, the system checks this check box to specify that this
device should immediately retry a video call as an audio call (if it
cannot connect as a video call) prior to sending the call to call
control for rerouting.
If you uncheck this check box, a video call that fails to connect as
video does not try to establish as an audio call. The call then fails to
call control, and call control routes the call via Automatic Alternate
Routing (AAR) and/or route/hunt list.
Table 92-2 Trunk Configuration Settings for SIP Trunks (continued)
Field Description