We have configured SIP trunk between CUCM to OCS and in between we have firewall. what are all the ports i need to allow in firewall for call establiishment between IP phone to Office communicator. Hope CUCM RTP media stream uses 16384-32766 UDP correct me if i am wrong.
1) What would be the source port range if a call is intiated from Office communicator.
2) What would be the source port range if a call is intitaed from Cisco IP phone.
3) CUCM to OCS SIP trunk port details?
Thanks in advance.