Cisco Cisco Expressway
Upspeeding from a voice call to a video call
Interworking a Lync client to an H.323 endpoint, the call will only upspeed from voice to video if the upspeed
request occurs before the endpoint sends a BRQ lowering the connection bandwidth.
request occurs before the endpoint sends a BRQ lowering the connection bandwidth.
Microsoft Mediation Server
Calls to Microsoft Mediation Servers work from endpoints in the Expressway video network for SIP initiated
calls, but do not work for interworked H.323 initiated calls (the mediation server does not respond to the
Expressway INFO message, sent to check availability of the destination number).
calls, but do not work for interworked H.323 initiated calls (the mediation server does not respond to the
Expressway 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 Expressway.
configured in Expressway.
The workaround is to send some calls through a different zone from the "Lync gateway" Expressway to the
Lync Server, as follows:
Lync Server, as follows:
1. Create a new neighbor zone and select Custom in the Zone profile field.
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.
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
.
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 SDP attribute line limit mode
On
SIP SDP attribute line limit length
130
SIP multipart MIME strip mode
On
SIP UPDATE strip mode
On
Interworking SIP search strategy
Info
SIP UDP/BFCP filter mode
Off
SIP Duo Video filter mode
On
Table 1: Custom neighbor zone attributes to work around Mediation Server limitation
Microsoft Lync and Cisco Expressway Deployment Guide (X8.5)
Page 63 of 71
Appendix 4: Interoperating capabilities and limitations