Hello! I have a problem integrating Avaya and Exchange 2013 CU1 UM.
In 2010 environment it works perfectly fine, however with Exchange 2013 I was unable to make it work.
I was looking into the packets sent by 2010 and 2013, the only difference is in 302 reply. Exchange 2010 sendsextension@ip:port as the Contact URI while Exchange 2013 sendsextension@fqdn:port
Avaya doesn't seem to recognize the format and instead of connecting to the specified within the contact field service just keeps querying TCP 5060 (Call Router Service).
Is there any way to force Exchange to use IP within the contact field instead of FQDN?
Pointing SIP Entity to 5065/5067 directly is not an option for obvious reasons well covered here on the forums.