I might just have solved my problem. I made a 12 minute call without disruption. What I did was to change the SIP server port to 4060 instead of 5060 and everything works fine so far. No more calls getting dropped at least in the three over-12minutes calls that I made after making this change in the router config. Might be my internet service provider is cutting the calls after around 5 minutes when using port 5060.
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