Background: CS1000M (option 81) release 5.0 TIE [QSIG] to CUCM 8.5 with Path Replacement (tromboning OFF) worked for two years.
Problem: Upgraded Nortel to 7.0 - one way communication on Nortel side. Cisco phones hear two-way, Nortel phones hear nothing (or they may hear dial-tone).
Temporary work around: Turned Path Replacement OFF on Cisco side. This is still not a good solution as now we will potentially use more channels between the TIE, depending on how calls are being handled.
Problem: Upgraded Nortel to 7.0 - one way communication on Nortel side. Cisco phones hear two-way, Nortel phones hear nothing (or they may hear dial-tone).
Temporary work around: Turned Path Replacement OFF on Cisco side. This is still not a good solution as now we will potentially use more channels between the TIE, depending on how calls are being handled.