Fongo Community Forums

Hi there,

I'm a longtime FPL user and have been running Asterisk virtualized for several years without issue. I wanted to add some redundancy so i decided to ditch virtualized Asterisk for a Yeastar S20 with a built in Cellular module to act as a failover for when the internet goes down.

The trunk and sip settings for the S20 seem a little different than any of the other PBXs' or ATAs i've I've configured in the past but I managed to get the device connected back to FPL.

Two problems: First,is inbound calls are drop approximately 32 seconds after the call is answered. Second, I don't hear the ringback tone when I make an outside call.

Please see screenshots of my current config from my S20 below.

Thank you in advance.

I don't have the device you're using, but I would guess the problem is the ACK response isn't being received after the 200 OK status.

Have you tried using voip4.freephoneline.ca:6060 instead, which is intended to circumvent faulty SIP ALG functions in routers?

And/or have you tried disabling SIP ALG in whatever router(s) you're using?