Calls originating from Nortel 1535 IP Phone will show the call "connected" on the display when the far end goes off-hook, however the far end hears only dead air and the 1535 continues to hear ringback. When the far end goes on-hook, the 1535 display registers the disconnect. This happens with calls terminating on POTS, AT&T Mobility and T-Mobile; I made outgoing calls to four numbers.
Audio works fine both ways when originating or terminating calls with Google Voice, voip.ms, or TCG aka AT&T voip. Voip.ms 4443 echo test works fine.
Behind this router, I use Acrobits on iOS and an OBi110, registering with voip.ms, never any audio problems.
Router = Ubiquiti EdgeRouter Lite with SIP disabled on CLI ("set system conntrack modules sip disable").
The 1535 is connected via Ethernet, not WiFi. Any clues for me?
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