(gdb) info stack
#0  0x08060034 in ast_bridged_channel (chan=0x8427c98) at channel.c:3281
#1  0xb7516fed in process_sdp (p=0x83ec2b0, req=0xb7501b18) at chan_sip.c:3787
#2  0xb7539df9 in handle_request_invite (p=0x83ec2b0, req=0xb7501b18, debug=0, ignore=0, seqno=15, sin=0xb7502ea0,
    recount=0xb7502eb0, e=0xb7501d37 "sip:113@192.168.2.9") at chan_sip.c:10630
#3  0xb753ffd8 in handle_request (p=0x83ec2b0, req=0xb7501b18, sin=0xb7502ea0, recount=0xb7502eb0, nounlock=0xb7502eb4)
    at chan_sip.c:11391
#4  0xb75428cf in sipsock_read (id=0x8172c38, fd=83, events=1, ignore=0x0) at chan_sip.c:11537
#5  0x08055efc in ast_io_wait (ioc=0x817a528, howlong=569) at io.c:284
#6  0xb752ea2e in do_monitor (data=0x0) at chan_sip.c:11700
#7  0xb7f6b34b in start_thread () from /lib/libpthread.so.0
#8  0xb7e4665e in clone () from /lib/libc.so.6