Cisco Cisco MeetingPlace IP Gateway

The value of the Minimum Session-Expires parameter must be less than or equal to the value of 
the Session-Expires parameter; otherwise, the value of the Minimum Session-Expires parameter 
defaults back to the value of the Session-Expires parameter whenever the Cisco Unified 
MeetingPlace H.323/SIP IP Gateway is restarted.

In this release, the Cisco Unified MeetingPlace H.323/SIP IP Gateway sends re-INVITE messages to 
maintain information about the availability of the other caller and to close audio server ports if the other 
caller is unavailable for a time period longer than the value of the Session-Expires parameter. It also 
handles different MinSE parameters when contacting the other caller to use the optimal value of the 
Session-Expires parameter for the other side.

Refer to SIP RFC 4028 for more details.

Added support for two redundant voice gateways (for SIP) or H.323 gateways (for H.323) in the Cisco 
Unified MeetingPlace H.323/SIP IP Gateway configuration, for a total of three gateways that can be 
specified.

For example, if there are three gateways and gateway 1 fails, calls are routed to gateway 2. If that fails, 
calls go to gateway 3, and if that fails, call are routed back to gateway 1.

Failovers, which are for outdialed calls only, can occur for the following reasons. PSTN cause codes are 
included where applicable:

Generic timeout

SIP Response Code 404, when accompanied by the following PSTN cause codes:

2 No route to specified transit network

3 No route to destination

26 Non-selected user clearing

27 Destination out of order

SIP Response Code 500 Internal server error

SIP Response Code 503, when accompanied by the following PSTN cause codes:

34 No circuit available

38 Network out of order

41 Temporary failure

42 Switching equipment congestion

47 Resource unavailable

All PSTN cause codes indicated above, and also

44 Requested circuit not available

102 Recovery on timer expiry