Yeastar S20 Please Help!

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Yeastar S20 Please Help!

Postby kjmj » 02/22/2017

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.

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Re: Yeastar S20 Please Help!

Postby Liptonbrisk » 02/23/2017

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 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?
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