(gdb) bt full
#0  0x001b31e3 in _int_malloc () from /lib/libc.so.6
No symbol table info available.
#1  0x001b3ffd in calloc () from /lib/libc.so.6
No symbol table info available.
#2  0x0807f7bd in ast_channel_alloc (needqueue=1, state=0, cid_num=0xb752d564 "0", cid_name=0xb752d503 "025388103", 
    acctcode=0x8141360 "", exten=0xb752d50d "972527655681", context=0xb752d4bf "rm1", amaflag=0, name_fmt=0x7c1496 "SIP/%s-%08x")
    at /usr/src/asterisk-1.4.18/include/asterisk/utils.h:359
        tmp = <value optimized out>
        flags = <value optimized out>
        ap1 = <value optimized out>
        ap2 = <value optimized out>
        __PRETTY_FUNCTION__ = "ast_channel_alloc"
#3  0x007722e6 in sip_new (i=0xb7512dc8, state=0, title=<value optimized out>) at chan_sip.c:3961
        my_name = 0xb7522248 "323c-Ï\"ñÿÿÿÿÿ\020À\001\200\t\001\a\001"
        tmp = <value optimized out>
        v = <value optimized out>
        fmt = <value optimized out>
        what = <value optimized out>
        needvideo = <value optimized out>
        video = <value optimized out>
        __PRETTY_FUNCTION__ = "sip_new"
#4  0x007b3cdf in handle_request_invite (p=0xb7512dc8, req=0xb7a7cf1c, debug=0, seqno=102, sin=0xb7a7e240, recount=0xb7a7e250, 
    e=0xb7a7d13f "sip:972527655681@ngn4.client.pins.net", nounlock=0xb7a7e254) at chan_sip.c:13896
        bridgepeer = <value optimized out>
        res = <value optimized out>
        gotdest = 0
        p_replaces = <value optimized out>
        replace_id = 0x0
        required = 0x7c140a ""
        required_profile = <value optimized out>
        c = <value optimized out>
        reinvite = 0
        __PRETTY_FUNCTION__ = "handle_request_invite"
#5  0x007b6937 in handle_request (p=0xb7512dc8, req=0xb7a7cf1c, sin=0xb7a7e240, recount=0xb7a7e250, nounlock=0xb7a7e254)
    at chan_sip.c:15241
        cmd = 0xa <Address 0xa out of bounds>
        cseq = <value optimized out>
        useragent = 0xb7a7d28c "Enswitch"
        seqno = 102
        len = <value optimized out>
        ignore = 0
        respid = <value optimized out>
        res = <value optimized out>
        debug = 0
        e = 0xb7a7d13f "sip:972527655681@ngn4.client.pins.net"
        __PRETTY_FUNCTION__ = "handle_request"
#6  0x007b80de in sipsock_read (id=0x90af740, fd=14, events=1, ignore=0x0) at chan_sip.c:15388
        req = {rlPart1 = 0xb7a7d138 "INVITE", rlPart2 = 0xb7a7d13f "sip:972527655681@ngn4.client.pins.net", len = 820, 
  headers = 14, method = 5, lines = 11, flags = 0, header = {0xb7a7d138 "INVITE", 
    0xb7a7d16e "Via: SIP/2.0/UDP 209.212.93.54:5060;branch=z9hG4bK070c8860;rport", 
    0xb7a7d1b0 "From: \"025388103\" <sip:0@209.212.93.54>;tag=as6fe34e3f", 
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