Knowledgebase: Digital Phone Services
Why am I only getting audio in one direction using SIP?
Posted by Nicky Smith on 28 June 2010 08:23 PM
For one way audio on SIP phones make sure both
phones have 'canreinvite' set to no in sip.conf. Also make sure any NAT in front of the phones has ports
10,000 - 20,000 open.

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