Cisco Cisco TelePresence Video Communication Server Expressway
Appendix 2 – Known interworking capabilities and limitations
Cisco VCS Deployment Guide: CUCM v6.1, 7 and 8 with Cisco VCS X6 using a SIP trunk
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Appendix 2 – Known interworking capabilities
and limitations
and limitations
Capabilities
SIP and H.323 endpoints making basic calls
SIP and H.323 endpoints can make calls via the Cisco VCS Control to endpoints registered to
CUCM.
CUCM.
Endpoints registered to CUCM can make calls to SIP and H.323 endpoints on the Cisco VCS
Control.
Control.
Limitations
E20 encryption
If E20 has Encryption Mode = Best Effort then calls from CUCM clear when E20 answers them. Set
Encryption Mode = Off.
Encryption Mode = Off.
T150 running L6.0 code
If a SIP call is made from a T150 running L6.0 code to CUCM 8.0 (and earlier), CUCM does not
handle the UPDATE message that the T150 sends immediately after the call is answered, and so on
call answer the call is cleared down immediately.
handle the UPDATE message that the T150 sends immediately after the call is answered, and so on
call answer the call is cleared down immediately.
If xConfiguration Conference H239 is set to Off then no BFCP is offered and CUCM handles the
UPDATE from the T150 and the call completes as desired.
UPDATE from the T150 and the call completes as desired.
H.323 MXP and 9971
When an MXP registered to Cisco VCS is in a call with a 9971 registered to CUCM and the MXP call
is H.323, the video on the MXP will be CIF (small picture) rather than VGA (full size picture).
is H.323, the video on the MXP will be CIF (small picture) rather than VGA (full size picture).
(Seen on MXP F9.0 and 9971 version 9.0.2)
If the MXP call is SIP, a full size picture will be seen.