I am facing this problem of integrating Mitel 3300 Cxii Controller with AVAYA Ip Office Manager using SIP trunks.
Although the setup has been done with the AVAYA team and Mitel Team . The Issue is, the call can be made from AVAYA to Mitel Extn. But not the other way . Either the call gets dropped or the AVAYA trace log reports Error" 402 - Bad Extension" . Both the PBx are on different Subnets. Can anybody help on this issue? or has faced this type of error. please help.