[Freeswitch-users] how to extract messages(SIP) from large pcap file.

Hi, I know this not a relevant forum for this type of question but hope some of you guys could help me with some pointers. I have a large pcap(dump) file with calls of multiple clients having different IPs. I want to extract messages based on different IPs and dump into separate dump file. How could I achieve this? Any help would be much appreciated. Thanks.