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  1. Prepend automatically replaced by Extension Number - Unable to make outbound call

    Additional Remark: (Sorry, trying to explain the situation as fully as I can) Every remote extension is located in different location with different WAN IP, so I don't think it is the issue of extensions fighting for the same SIP or RTP ports.
  2. Prepend automatically replaced by Extension Number - Unable to make outbound call

    Update: 1. The problem occurs on OLD extensions migrated from v12 and also occurs on NEWLY created extensions in v15.5. (All remote direct STUN) 2. I don't think it is the problem of my IP Phone, since it occurs to 3CX Android Phone, supported Yealink and unsupported Cisco ATA. 3. If I delete...
  3. Prepend automatically replaced by Extension Number - Unable to make outbound call

    Hi Community, I migrated to v15.5 from v12 in the past weekend (Thanks to 3CX's generous offer and v15.5 is such a great product). However, I have encountered something really strange. 3 or 4 extensions out of about 30+ extensions (remote direct STUN extension) have not been able to make...
  4. RTP Port Configuration

    @eddv123, your help is much appreciated!
  5. RTP Port Configuration

    I am concurrently using v12 and v14. I just downloaded v15.5 for trial purpose. I was trying to change the RTP ports on v15.5 (Linux) since its RTP ports conflicts with my v12's on the same WAN. To my surprise, there is no option for changing RTP port range under v15.5 [Setting -> Network]...
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