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Dropping Calls on 21 Seconds (alien.top)

submitted 1 year ago by HighRichard@alien.top to c/voip@netheads.online

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Hello, hope everything is good.

So recently inherited a customer which has a self-hosted Issabel PBX with about 15 users, really small company.

For the past few days outgoing calls have been dropped at exactly 21 seconds, calls connect and you can hear the person on the other side of the line but at exactly 21 seconds call is dropped.

Fairly new to VOIP in general specially with this PBX, any tip greatly appreciated

Thanks in advance!

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[–] Whatwhenwherehi@alien.top 1 points 1 year ago

This is a known issue. Google it to narrow down further but essentially there is a keepalive that should be sent at around 30 seconds (roughly, depends somewhat on where you start counting). Without this keepalive packet the call will drop as the carrier assumes you left.

It's been years since I hit this issue. Since you using a bad pbx system I won't help further than say most have already given you the likely solution but it's highly likely you need to consider ports, and said keepalive or ack in general.

Here's people fighting and resolving: https://stackoverflow.com/questions/27614532/sip-call-drop-after-30seconds