All our ASA/FWSM/PIX firewalls support SIP inspection.
We support all versions of SIP.
Here is the command ref link for inspect sip:
There are 5 versions of the SCCP protocol: 2.4, 3.0.4, 3.1.1, 3.2, and 3.3.2. The adaptive security appliance supports all versions through Version 3.3.2. The adaptive security appliance provides both PAT and NAT support for SCCP. PAT is necessary if you have limited numbers of global IP addresses for use by IP phones.
-Kureli