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When I make a call from one MAX 410/420/430 SIP to another MAX 410/420/430 SIP, one side cannot hear the communication. What could be the problem?

April 26, 2017communication hear Max problem SIP

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When I make a call from one MAX 410/420/430 SIP to another MAX 410/420/430 SIP, one side cannot hear the communication. What could be the problem?

1 Answer

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A. There could be various reasons for this problem: First, make sure that both units have been upgraded to the latest firmware. (Check the software version on your device by accessing the System Information page on the Web Manager, or log into the command line interface and examine the /SYSTEM/VERSION menu option.) Go to www.voicedirector.net to confirm if there is a new release after your version. If upgrading the software version does not solve the problem, one of the phones could be behind a firewall that might be blocking RTP traffic. Check the RTP port settings on the phone behind the firewall and make sure that port is not blocked. The RTP port used by the phone can be changed if required.