Access for SIP server through ASA

[rehan_uet]

I have a third party sip server on my internal network and I need to open the access for an external SIP server on ASA to make a SIP trunk with my SIP server. What ports I need to open for external SIP server on ASA to successfully communicate with my SIP server through SIP trunk.

[Jennifer Halim]

Default port that ASA uses for SIP is 5060, and ASA also has inspection engine for SIP protocol.

More information on the following doc:

http://www.cisco.com/en/US/docs/security/asa/asa82/command/reference/i2.html#wp1743169

However, you would need to check with your external SIP server/provider on what port(s) they are using as they could be using non standard port for the communication.