Hello,
My idea is basically pass the SIP traffic through a TURN server to overcome
some firewall limitations.
I'm using PJSUA, registering an UDP transport using pjsua_transport_create
as usual, and, when I discover a timeout 408 during the first REGISTER, my
idea was to close the previously created UDP transport and register a new
one. I've implemented a sip_transport_turn.c based on the
sip_transport_udp.c, and during the initialization it sends an allocate
request to TURN to listen to SIP packets. In the on_rx_data callback, I am
checking if this is the first time I am sending packets to this
destination, and, if so, I'm using the pj_turn_sock_set_perm to add
permission to send data.
Everything is great in theory, but I am facing a lot of problems in PJSUA
code (I'm using PJSIP 2.0):
1 - I'm trying to close the UDP transport in the on_reg_state callback
from pjsua_acc, using the function pjsua_transport_close;
1.1 - If I try to pass PJ_TRUE to force the destruction of the UDP
transport, there is an assertion error being thrown
in pjsip_transport_destroy:
PJ_ASSERT_RETURN(pj_atomic_get(tp->ref_cnt) == 0, PJSIP_EBUSY);
1.2 - If I try to pass PJ_FALSE, then the UDP transport is smoothly
destroyed after a while, but in this case PJSUA maintains an invalid
pointer in pjsua_var structure (specifically in tpdata member).
As there is no examples of real use case scenarios using PJNATH and SIP
together, I'm clueless.
Regards,
Guilherme Balena Versiani.
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