This should resolve your issue.
ZOIPER WON'T WORK WITH PJSIP - ERROR CODE 488
A client that was using Zoiper 5, and we moved them across from SIP to PJSIP. Should be real simple, just add the port 5061 (or whatever your PJSIP port is) to the end of the domain name. Well, when you do that it registers, and things seem great. Make a call to the extension - work perfect. Now try to make a call out ... you may discover that you get an error code of 488 and immediately the call fails.
The answer is to go into advanced settings of your account on Zoiper and change RTCP Feedback to "OFF"
The answer is to go into advanced settings of your account on Zoiper and change RTCP Feedback to "OFF"
This should resolve your issue.
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