It's worth a shot. Yes.
this post was submitted on 23 Oct 2023
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Often a firewall issue. SIP ALG or a required port not allowing traffic.
this is the answer
Interesting, but why exactly 21 seconds?
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
Sounds like you have 21 seconds to go