Cisco Cisco TelePresence Management Suite (TMS) Version 15
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Unified CM SME to Cisco Expressway-C.
Note: In multi-cluster systems with three or more clusters, where one Unified CM cluster is a dedicated
Unified CM SME, endpoints never register to the Unified CM SME but always to a leaf Unified CM cluster.
Unified CM SME, endpoints never register to the Unified CM SME but always to a leaf Unified CM cluster.
Scenario 3. Configuring Early Offer in a multi-cluster system
One or more SME clusters with connected leaf Unified CM clusters. The conference bridges are connected
to the leaf cluster(s). A single trunk connects the SME to the Cisco Expressway-C. In this scenario the
following trunks must be configured for Early Offer:
to the leaf cluster(s). A single trunk connects the SME to the Cisco Expressway-C. In this scenario the
following trunks must be configured for Early Offer:
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Unified CM SME to Cisco Expressway-C.
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Leaf Unified CM clusters to the Unified CM SME.
Configuring Early Offer (and fallback to Delayed Offer) for SIP trunks
1. For each trunk, do one of the following depending on your Unified CM version:
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For Unified CM Version 9.1(2) systems, enable the Early Offer support for voice and video calls
(insert MTP if needed).
(insert MTP if needed).
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For Unified CM Version 10.5 systems, in the Early Offer support for voice and video calls
dropdown, select Best Effort (no MTP inserted).
dropdown, select Best Effort (no MTP inserted).
2. Remove all MTP resources from the following elements:
a. SME clusters (in the case of Unified CM SME deployments).
b. All TelePresence endpoints and SIP trunks on all Unified CM clusters.
b. All TelePresence endpoints and SIP trunks on all Unified CM clusters.
3. Set SIP Trunk DTMF Signaling Method to RFC 2833 (the default).
4. Enable the Accept Audio Codec Preference in Received Offer option on the following elements:
a. All SME SIP trunks (in the case of Unified CM SME deployments).
b. All SIP trunks that carry TelePresence calls on all Unified CM clusters.
b. All SIP trunks that carry TelePresence calls on all Unified CM clusters.
Fallback to Delayed Offer
For outgoing calls, the default settings provide for automatic fallback to Delayed Offer in cases where no
MTP resource exists. Without fallback, issues may arise in non-Optimized Conferencing areas of the
network. For incoming calls, Early Offer is supported with no requirement for MTP resources.
MTP resource exists. Without fallback, issues may arise in non-Optimized Conferencing areas of the
network. For incoming calls, Early Offer is supported with no requirement for MTP resources.
Endpoints
Any TelePresence endpoints registered to Unified CM should be configured with a Media Resource Group
List (MRGL) that does not contain any MTP resources. So that when the endpoints place a call that traverses
one of the above trunk types an MTP will not be available within the MRGL of the endpoint.
List (MRGL) that does not contain any MTP resources. So that when the endpoints place a call that traverses
one of the above trunk types an MTP will not be available within the MRGL of the endpoint.
Configuring a Routing Rule for Bridges Trunked to Unified
CM
CM
For Unified CM-centric deployments, it is required to set up a routing rule for any MCU or TelePresence
Server trunked to Unified CM.
Server trunked to Unified CM.
If your MCU or TelePresence Server is trunked to Unified CM, it will dial a long string of characters at your
CMR Hybrid site (example: yoursite.webex.com)
CMR Hybrid site (example: yoursite.webex.com)
Cisco Collaboration Meeting Rooms (CMR) Hybrid Configuration Guide (TMS 14.4 - WebEx WBS29)
Page 66 of 186
Configuring Call Control
Configuring Cisco Unified Communications Manager