(gdb) bt full
#0  0x080bd32e in ast_rtp_lookup_code (rtp=0x0, isAstFormat=1, code=4)
    at rtp.c:1589
        pt = 4
#1  0x080bb9d0 in bridge_p2p_rtp_write (rtp=0x9488918, rtpheader=0x948899c,
    len=172, hdrlen=12) at rtp.c:998
        bridged = (struct ast_rtp *) 0x0
        res = 0
        payload = 0
        bridged_payload = 0
        version = 2
        padding = 0
        mark = 0
        ext = 0
        rtpPT = {isAstFormat = 1, code = 4}
        seqno = 53231
        __PRETTY_FUNCTION__ = "bridge_p2p_rtp_write"
#2  0x080c2070 in p2p_rtp_callback (id=0x9511fb8, fd=321, events=1,
    cbdata=0x9488918) at rtp.c:2847
        res = 172
        hdrlen = 12
        sin = {sin_family = 2, sin_port = 38985, sin_addr = {
    s_addr = 312358723}, sin_zero = "\000\000\000\000\000\000\000"}
        len = 16