Hi friends,
I have used PJSIP for my project for months. I succeed to send RTP packets
between different NAT, both in RELAY and P2P mode. It works fine! Thanks to
the great job by the PJSIP team!
But I found a strange issue: PJSIP does not use TURN as its last resort!
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[Test 1]
- TURN is DISABLED in pjsua_media_config:
Result: SIP call works between SIP clients in different NATs. As a result, P2P
connection can be established between these TWO NATs.
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[Test 2]
- Set up turnserver on host-hp01;
- ENABLE TURN in pjsua_media_config;
- SAME network and hardware as [Test 1];
Result: SIP call works between different NATs. But tcpdump on host-hp01 shows
that it is relaying packets between SIP clients! Why does PJSIP not use P2P mode?
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Guilin Cao
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