(gdb) f 0
#0  0x080e3e15 in ast_rtcp_write (data=0xabe90630) at rtp.c:2903
2903            if (!rtp || !rtp->rtcp)
(gdb) p rtp->rtcp
Cannot access memory at address 0xabe92fb8
(gdb)

#0  0x080e3e15 in ast_rtcp_write (data=0xabe90630) at rtp.c:2903
2903            if (!rtp || !rtp->rtcp)
(gdb) bt full
#0  0x080e3e15 in ast_rtcp_write (data=0xabe90630) at rtp.c:2903
        rtp = (struct ast_rtp *) 0xabe90630
        res = 136437192
#1  0x0810284e in ast_sched_runq (con=0x821ddc8) at sched.c:371
        current = (struct sched *) 0x8e0e820
        tv = {tv_sec = 1195224579, tv_usec = 2461}
        numevents = 15
        res = 64
#2  0xb672825a in do_monitor (data=0x0) at chan_sip.c:16805
        res = 1
        dialog = (struct sip_pvt *) 0x0
        t = 1195224578
        reloading = 0
        __PRETTY_FUNCTION__ = "do_monitor"
#3  0x08111777 in dummy_start (data=0x821f8f8) at utils.c:858
        _buffer = {__routine = 0x806ca45 <ast_unregister_thread>, __arg = 0xb66dcba0, __canceltype = 0, __prev = 0x0}
        ret = (void *) 0x0
        a = {start_routine = 0xb6727f3a <do_monitor>, data = 0x0,
  name = 0x821f908 "do_monitor", ' ' <repeats 11 times>, "started at [16833] chan_sip.c restart_monitor()"}
#4  0xb7eaa3cc in start_thread () from /lib/tls/libpthread.so.0
No symbol table info available.
#5  0xb71ffc3e in clone () from /lib/tls/libc.so.6
No symbol table info available.