How to I force a certificate update when a provider updates their security certificate?

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My voip provider has updated their security certificate but Zoiper just keeps giving me SIP 503 Certification Validation Failure. On other voip clients, I was prompted to accept the updated certificate but not on Zoiper for windows. I have also tried deleting and re-adding the voip account but I still get the same error.

asked Jun 13, 2016 in Windows by SoulOpera (120 points)  

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