Zoiper SIP error 503

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I am having issue with zoiper. I am not able to call out or receive calls. my callers receives an error SIP  503.

Please help me


asked Sep 27, 2018 in General by peter.k (120 points)  


This error usually means DNS or transport issues. if the remote side receives this error, only when is calling your number, your (or his) VoIP service provider might be generating custom errors. In this case you need to contact the service provider and clarify what this error means.

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