#0  0xb76489da in sip_setoption (chan=0xcfda060, option=13, data=0xcfb9fe8, datalen=4) at chan_sip.c:4012
4012                    res = ast_rtp_instance_make_compatible(chan, p->rtp, (struct ast_channel *) data);
(gdb) bt
#0  0xb76489da in sip_setoption (chan=0xcfda060, option=13, data=0xcfb9fe8, datalen=4) at chan_sip.c:4012
#1  0x080bd95f in ast_channel_setoption (chan=0xcfda060, option=13, data=0xcfb9fe8, datalen=4, block=0) at channel.c:7296
#2  0x080b689d in ast_channel_make_compatible_helper (from=0xcfda060, to=0xcfb9fe8) at channel.c:5586
#3  0x080b6bb0 in ast_channel_make_compatible (chan=0xcfda060, peer=0xcfb9fe8) at channel.c:5636
#4  0x080bd568 in ast_channel_bridge (c0=0xcfda060, c1=0xcfb9fe8, config=0xb39b67f8, fo=0xb39b5924, rc=0xb39b5920) at channel.c:7239
#5  0x080f4c3b in ast_bridge_call (chan=0xcfda060, peer=0xcfb9fe8, config=0xb39b67f8) at features.c:3256
#6  0xb41667c1 in dial_exec_full (chan=0xcfda060, data=0xb39b8d88 "SIP/dw01", peerflags=0xb39b6bac, continue_exec=0x0) at app_dial.c:2641
#7  0xb41671a0 in dial_exec (chan=0xcfda060, data=0xb39b8d88 "SIP/dw01") at app_dial.c:2741
#8  0x081329b0 in pbx_exec (c=0xcfda060, app=0xce964e0, data=0xb39b8d88 "SIP/dw01") at pbx.c:1407
#9  0x0813bab0 in pbx_extension_helper (c=0xcfda060, con=0x0, context=0xcfda3cc "from_nvst_cliok", exten=0xcfda41c "01", priority=1, label=0x0,
    callerid=0xcfb5ae0 "069911160036", action=E_SPAWN, found=0xb39bb280, combined_find_spawn=1) at pbx.c:4086
#10 0x0813d49b in ast_spawn_extension (c=0xcfda060, context=0xcfda3cc "from_nvst_cliok", exten=0xcfda41c "01", priority=1,
    callerid=0xcfb5ae0 "069911160036", found=0xb39bb280, combined_find_spawn=1) at pbx.c:4605
#11 0x0813de50 in __ast_pbx_run (c=0xcfda060, args=0x0) at pbx.c:4703
#12 0x0813f8ef in pbx_thread (data=0xcfda060) at pbx.c:5014
#13 0x081901dc in dummy_start (data=0xcfb5f08) at utils.c:970
#14 0xb7b3cf3b in start_thread () from /lib/libpthread.so.0
#15 0xb7d57d0e in clone () from /lib/libc.so.6