Cisco Cisco TelePresence Management Suite (TMS) Version 15
The configuration steps are detailed in the Cisco Unified Communications Manager with Cisco VCS
Deployment Guides at the following locations:
For Unified CM 9.x or later and VCS X8.5 or later:
For Unified CM 9.x or later and Expressway X8.5 or later:
Configuring Early Offer for SIP Messaging
Configuring Early Offer is only required for a Unified CM-centric deployment, where bridges are trunked and
endpoints are registered to Unified CM.
With Early Offer, the session initiator sends its capabilities in the SIP Invite and the called device chooses
the preferred codec. Cisco recommends that all SIP trunks which carry TelePresence calls are configured for
Early Offer.
Additionally, Early Offer is required from any direct scheduled bridges to Cisco Expressway or Cisco VCS to
support CMR Hybrid calls. The entire path from the calling device to the service must be configured to
support Early Offer.
Cisco VCS-centric deployments always run in Early Offer mode and this section is only relevant to Unified
CM-centric deployments. It provides the recommended approach for configuring outbound trunks as Early
Offer.
Note: The default configuration for Unified CM trunks is Delayed Offer.
All trunks between the following Optimized Conferencing elements should be enabled for Early Offer. No
media termination point (MTP) resources should be made available to these trunks, directly or indirectly:
n
Unified CM to Cisco Expressway-C
n
Unified CM to Cisco VCS Control
n
Unified CM to TelePresence Server
n
Unified CM to MCU
n
Unified CM to Unified CM trunks which carry traffic originating from a TelePresence endpoint and any of
the network elements listed above should also be enabled for Early Offer, with no media termination point
(MTP) resources. For example, in a call flow scenario of EX90 >> UCM1 >> UCM2 >> Conductor >>
TelePresence Server, the trunk between UCM1 >> UCM2 and the trunk between UCM2 >> Conductor
should be enabled for Early Offer.
Cisco Collaboration Meeting Rooms (CMR) Hybrid Configuration Guide (TMS 14.6 - WebEx WBS29.11)
Page 101 of 254
Configuring Call Control
Configuring Cisco Unified Communications Manager