SIP VOIP Phone can't hear Caller

Question: Why is my #VOIP Phone not allowing me to hear the caller?


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Answer: If you have access to the #SIP Server, check to see if you have 
pedantic=yes flag in the Sip.conf file, if you do then comment it out as shown below
;pendantic=yes and reload the core reload.

After the reload happens, test again and see if the problem persists.