Cisco Cisco TelePresence Video Communication Server Expressway
Lync Client
Lync Client Stuck in ‘Connecting …’ State
This could be because the Lync client is not receiving media. The client cannot change into the "Connected" state
until it receives RTP (media) from the other party.
until it receives RTP (media) from the other party.
Microsoft Mediation Server
Calls to Microsoft Mediation Servers work from endpoints in the VCS video network for SIP initiated calls, but do not
work for interworked H.323 initiated calls (the mediation server does not respond to the VCS INFO message, sent to
check availability of the destination number).
work for interworked H.323 initiated calls (the mediation server does not respond to the VCS INFO message, sent to
check availability of the destination number).
A workaround is possible if the format of the numbers that will be routed to the mediation server can be configured in
VCS.
VCS.
The workaround is to send some calls through a different zone from the Gateway VCS to the Lync Server, as follows:
1.
Create a new neighbor zone and select Custom in the Zone profile field.
2.
3.
Configure one or more search rules, with the correct priority, such that the appropriate subset of calls destined
for the Mediation Server are routed through the new zone rather than the standard "To Microsoft Lync Server
via B2BUA" zone.
for the Mediation Server are routed through the new zone rather than the standard "To Microsoft Lync Server
via B2BUA" zone.
4.
You may also need to change the On successful match action from Stop to Continue on the search rule in the
"To Microsoft Lync Server via B2BUA" zone. See
"To Microsoft Lync Server via B2BUA" zone. See
.
Setting
Lync Server zone configuration
Monitor peer status
Yes
Call signaling routed mode
Auto
Automatically respond to H.323 searches
Off
Automatically respond to SIP searches
On
Send empty INVITE for interworked calls
Off
SIP poison mode
On
SIP encryption mode
Microsoft
SIP multipart MIME strip mode
On
SIP UPDATE strip mode
On
Interworking SIP search strategy
Info
SIP UDP/BFCP filter mode
Off
SIP record route address type
Hostname
SIP Proxy-Require header strip list
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Table 19 Custom neighbor zone attributes to work around Mediation Server limitation
Presentation Handover Fails in TelePresence Server Conference
Symptom: A participant cannot share their screen when another participant has been sharing.
52
Cisco VCS and Microsoft Lync Deployment Guide
Appendix 1: Troubleshooting