Let me describe my problem first. I'm using Sofia SIP for a telephony
application and the SIP proxy I'm using is behind a NAT. This means that an
incoming invite from the proxy has as Contact header the internal proxy IP
(for example 10.0.0.1). This means that when I hang up the phone from my
application Sofia automatically sets as destination for the BYE message the
IP 10.0.0.1, which as you can imagine is not routable and as a result it
fails.
So what I want to do is to change the destination for the BYE message to be
the 'external' proxy IP address. The problem is that Sofia doesn't seem to
allow me to change the destination for the SIP message; it always uses the
contact it got when receiving the INVITE. Here's what I've tried:
1.
Enforcing a hardcoded value for SIPTAG_TO:
nua_bye(op->op_handle, SIPTAG_TO(sip_to_make(ssc->ssc_home, "
sip:alice@54.15.123.11")), TAG_END());
The result for this was that the To header was updated with external ip but
the SIP message was still destined to the internal proxy ip
1.
Enforcing a a hardcoded value to NUTAG_URL:
sip_to_t * to = sip_to_make(ssc->ssc_home, "sip:alice@54.15.123.11");
ua_bye(op->op_handle, NUTAG_URL(to->a_url), TAG_END());
This had no effect.
1.
Enforcing hardcoded value for SIPTAG_REQUEST_STR:
nua_bye(op->op_handle, SIPTAG_REQUEST_STR("BYE sip:alice@54.15.123.11
SIP/2.0"), TAG_END());
This had no effect.
1.
Did the same but through the transaction handle:
nua_set_hparams(op->op_handle,SIPTAG_REQUEST_STR("BYE
sip:alice@54.15.123.11 SIP/2.0"), TAG_NULL());
nua_bye(op->op_handle, TAG_END());
Again no effect
Then I thought of going a little earlier when the incoming INVITE arrived
from the proxy and maybe alter the contact, since this is where the
subsequent BYE is sent, but again no luck: trying to update it through
nua_set_hparams had no effect same for the global params with
nua_set_params.
Seems that what I want to do is very simple (and necessary given the NAT
configurations out there) but yet it's as if Sofia specifically disallows
it (if you check the nua_bye docs there aren't any relevant TAGS
documented).
I also thought of using one of Sofia's lower level APIs such as NTA
(instead NUA) but it seems very hard to mix NUA with any of the lower level
APIs.
Any ideas are more than welcome
Best regards,
Antonis
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