#0  0xb76999da in sip_setoption (chan=0xc9869b8, option=13, data=0xc96d9c8, datalen=4) at chan_sip.c:4012
4012                    res = ast_rtp_instance_make_compatible(chan, p->rtp, (struct ast_channel *) data);
(gdb) bt
#0  0xb76999da in sip_setoption (chan=0xc9869b8, option=13, data=0xc96d9c8, datalen=4) at chan_sip.c:4012
#1  0x080bd95f in ast_channel_setoption (chan=0xc9869b8, option=13, data=0xc96d9c8, datalen=4, block=0) at channel.c:7296
#2  0x080b689d in ast_channel_make_compatible_helper (from=0xc9869b8, to=0xc96d9c8) at channel.c:5586
#3  0x080b6bb0 in ast_channel_make_compatible (chan=0xc9869b8, peer=0xc96d9c8) at channel.c:5636
#4  0x080bd568 in ast_channel_bridge (c0=0xc9869b8, c1=0xc96d9c8, config=0xb3a077f8, fo=0xb3a06924, rc=0xb3a06920) at channel.c:7239
#5  0x080f4c3b in ast_bridge_call (chan=0xc9869b8, peer=0xc96d9c8, config=0xb3a077f8) at features.c:3256
#6  0xb41b77c1 in dial_exec_full (chan=0xc9869b8, data=0xb3a09d88 "SIP/dw01", peerflags=0xb3a07bac, continue_exec=0x0) at app_dial.c:2641
#7  0xb41b81a0 in dial_exec (chan=0xc9869b8, data=0xb3a09d88 "SIP/dw01") at app_dial.c:2741
#8  0x081329b0 in pbx_exec (c=0xc9869b8, app=0xc841178, data=0xb3a09d88 "SIP/dw01") at pbx.c:1407
#9  0x0813bab0 in pbx_extension_helper (c=0xc9869b8, con=0x0, context=0xc986d24 "from_nvst_cliok", exten=0xc986d74 "01", priority=1, label=0x0,
    callerid=0xc7d9898 "069911160036", action=E_SPAWN, found=0xb3a0c280, combined_find_spawn=1) at pbx.c:4086
#10 0x0813d49b in ast_spawn_extension (c=0xc9869b8, context=0xc986d24 "from_nvst_cliok", exten=0xc986d74 "01", priority=1,
    callerid=0xc7d9898 "069911160036", found=0xb3a0c280, combined_find_spawn=1) at pbx.c:4605
#11 0x0813de50 in __ast_pbx_run (c=0xc9869b8, args=0x0) at pbx.c:4703
#12 0x0813f8ef in pbx_thread (data=0xc9869b8) at pbx.c:5014
#13 0x081901dc in dummy_start (data=0xc85a3d0) at utils.c:970
#14 0xb7b8df3b in start_thread () from /lib/libpthread.so.0
#15 0xb7da8d0e in clone () from /lib/libc.so.6