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Does Xfinity support Session Initiation Protocol (SIP) for VOIP phones on residential service?

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Does Xfinity support Session Initiation Protocol (SIP) for VOIP phones on residential service?

VOIP phone drops connection after 30 seconds on outgoing calls only.  Does not drop connection on incoming calls.

 

I rebooted the router, reconfigured the router, Comcast replaced the router still not working and no explanation why not working.

 

Does Xfinity support Session Initiation Protocol (SIP) Protocol for VOIP phones on residential service?

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