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Not able to call extesnions

Hi,

I am not able to call extension to extension. I am however able to call using a trunk from those particular extension.

I am using Zoiper in mobile and pc to try to test the calls.

I keep getting this error message in the sip log

901@192.168.1.12:40409;rinstance=ab35de7621326849;transport=U' is not a valid SIP contact (missing sip trying to use anyway

Please help someone