In CM 8.1 the SIP transaction table holds 10K entries, each for 32 seconds after the dialog ends (before being removed). Since CM supports 30k SIP stations, the SIP transaction table size should be increased. This mostly comes into play when a large number of SIP stations register to SM and send SUBSCRIBE messages for avaya-cm-features and MWI. This might occur during the recovery from network outage, power outage or Session Manager outage/maintenance.

When the table size limit is reached, CM initiates a WARM 1 restart. If that doesn't resolve the issue, a second WARM 1, followed by an interchange occurs.