SPA112 ATA

brb5548

Member
Sep 26, 2018
53
6
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I have never been able to get UDP transport to work on these devices behind NAT. It is always my protocol choice due to the fact that it gets around most router issues. I am curious, has anyone been successful getting UDP behind a single NAT to work (with or without STUN)?
 

gunemalli

New Member
Dec 18, 2018
24
2
3
Change the SIP Listen port to something other than the 5060. Most of the time this resolves the issue.
If your WAN IP is static, then have EXT IP field filled in with that.
 

DigitalDaz

Administrator
Staff member
Sep 29, 2016
2,329
365
83
TCP usually works far more reliably than UDP. They key with those things, if they are the same as SPA phones is in the advanced sip settings to enable "insert via rport" and "handle via rport".
 

brb5548

Member
Sep 26, 2018
53
6
8
42
I didn't have access to make network/router changes so I had to support UDP to get around that limitation.

I heavily use the ATA for faxing and both UDP and TCP are working really well with the mod_spandsp based t38 gateway. I would like to use TLS on these Cisco ATAs but it looks like you have to get a signed cert from Cisco to support this. I am also very concerned about the lack of HTTPS/TLS support for provisioning as this is a big red flag for me.

Really appreciated the insight.