[pjsip] STUN in local network

[Thiago Guimarães]

Hello,

I'm using pjsua2 in conjunction with the classes and functions of pjlib for
an application. But I'm having a little problem, which I could not solve.

On the same specific network, I have two endpoints registered on a remote
SIP server (public ip). When they are set to use STUN, I can do / accept
INVITE, but the audio does not travel over the network. In the same
environment, if one of the endpoints is not using STUN, audio travels
normally. Another detail, with STUN enabled at both endpoints, if one of
these endpoints is on another network, audio travels normally.

However, in another network with the same characteristics
(PJ_STUN_NAT_TYPE_PORT_RESTRICTED) according to the STUN resolution, the
two endpoints "talk" normally.

Evaluating the firewall of this first network, I found nothing that could
be blocking this communication.

Comparing the pjsip logs to the Xcode console, I could not find any
information that could help me understand what's happening.

If anyone can help me,
Thank
​s​
.
Thiago
​ Guimarães​
.