1. nta.c:6791 incoming_reply() nta: sent 100 Trying for INVITE (410797326)
2. nua_stack.c:271 nua_stack_event() nua(0x7f096400d550): event i_invite 100 Trying
3. nua_session.c:4139 signal_call_state_change() nua(0x7f096400d550): call state changed: init -> received, received offer
4. soa.c:1098 soa_get_remote_sdp() soa_get_remote_sdp(static::0x7f0964013310, [0x7f0993fc2528], [0x7f0993fc2520], [(nil)]) called
5. nua_stack.c:359 nua_application_event() nua: nua_application_event: entering
6. nua_stack.c:271 nua_stack_event() nua(0x7f096400d550): event i_state 100 Trying
7. nua.c:342 nua_handle_bind() nua: nua_handle_bind: entering
8. nua_stack.c:359 nua_application_event() nua: nua_application_event: entering
9. nua.c:366 nua_handle_magic() nua: nua_handle_magic: entering
10. nua.c:366 nua_handle_magic() nua: nua_handle_magic: entering
11. nua.c:366 nua_handle_magic() nua: nua_handle_magic: entering
12. nua.c:366 nua_handle_magic() nua: nua_handle_magic: entering
13. nua.c:879 nua_respond() nua: nua_respond: entering
14. nua_stack.c:529 nua_signal() nua(0x7f096400d550): sent signal r_respond
15. nua_stack.c:573 nua_stack_signal() nua(0x7f096400d550): recv signal r_respond 480 Temporarily Unavailable