Half-Duplex incoming calls (outgoing is fine)

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wr5678:
The "router" in this case is a DSL modem, it's own SIP device (providing a "landline" from the ISP), and a WiFi AP all-in-one, so plugging directly into the modem is a non-starter.

The device does get a routeable IP address, I've tried making it a DMZ host (there is an option to forward incoming to a single host on the network in the router), that didn't make a difference.

If it's some sort of routing problem, why do both RTP streams come up and work for an outgoing call, but not for an incoming call (i.e. the caller hears me, but I don't hear them).  I have a SIP trace of an incoming call in this state if someone from obihai support wants to look at it.

lhm.:
Try this,

Switching your OBi's Ethernet ports to 100 mb/s full duplex:

1. Dial *** (wait for response) then press 0
2. Enter option 27 and press #
3. Press 1 to set a new value
4. Enter a value of 1 and press #
5. Press 1 to confirm/save
6. Hang up
7. Wait for the OBi to reboot

wr5678:
I doubt that the duplex on the ethernet side is the issue, but I tried the 100mb/full duplex thing anyway.  Didn't make any difference.

Neither did setting up a STUN server.

giqcass:
The router has its own voip system in place.  I wonder if that somehow causes the problem.  Perhaps switching to non standard ports might help. Instead of 5060 maybe 11116.

wr5678:
Contacted my SIP provider and tried an alternate port, also switched from UDP to TCP.  Neither helped

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