#0  opbx_udptl_set_active (udptl=0x0, active=0) at udptl.c:873
#1  0xa656c259 in sip_alloc (callid=0x0, sin=0x0, sout=0x0, useglobal_nat=0, intended_method=5)
    at chan_sip.c:3785
#2  0xa6571c58 in sip_request_call (type=0x805d76c "SIP", format=64, data=0x805d86c,
    cause=0xa61b8368) at chan_sip.c:13046
#3  0xa7ecbbb4 in opbx_request (type=0x805d76c "SIP", format=64, data=0x805d86c, cause=0xa61b8368)
    at channel.c:2365
#4  0xa7ed0781 in __opbx_request_and_dial (type=0x805d76c "SIP", format=64, data=0x805d86c,
    timeout=30000, outstate=0xa61b8448, cid_num=0x805dd70 "", cid_name=0x805de70 "", oh=0xa61b83d4)
    at channel.c:2200
#5  0xa7ef36c9 in opbx_pbx_outgoing_exten (type=0x805d76c "SIP", format=64, data=0x805d86c,
    timeout=30000, context=0x805dc6c "faxout", exten=0x805db6c "s", priority=1, reason=0xa61b8448,
    sync=2, cid_num=0x805dd70 "", cid_name=0x805de70 "", vars=0x8093148, channel=0x0) at pbx.c:5166
#6  0xa654655b in attempt_thread (data=0x805d658) at pbx_spool.c:266
#7  0xa7e4e0bd in start_thread () from /lib/tls/libpthread.so.0
#8  0xa7c818fe in clone () from /lib/tls/libc.so.6