Automatic CANCEL signal from the caller

I am using an ARI app to place calls through Asterisk. The calls are forwarded to a GSM gateway.

There is a problem where a lot of the calls are being Cancelled (CANCEL) exactly after 31 seconds of the first INVITE. I am making an assumption that this doesn’t happen once the call is Rejected or Picked by the Destination.

Is there a CANCEL timeout that I am unaware of? Can I increase it?

Screenshot 2021-07-28 at 1.13.36 PM

The ARI originate route has a default timeout of 30[1] but can be changed.

[1] Asterisk 19 Channels REST API - Asterisk Project - Asterisk Project Wiki

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