As discussed here
https://community.sophos.com/products/unified-threat-management/astaroorg/f/54/t/39200
Some VOIP providers use a non standard SIP port number. I also imagine some companies using VOIP would like to use a non standard SIP port number given the chance.
The request is to allow the port that the SIP service monitors to be changed from the default port of 5060.
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