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  1. roelb

    Problem with Dahua OUTDOOR intercom VTO VTH and Asterisk: Retransmission timeout reached on transmission.

    Figured it out. The Dahua won't respond to an "OK" without a SIP progress message (183 SESSION PROGRESS) in between. I auto-answer doorphone calls in asterisk (and then send a doorbell chime and a progress indication). Thas has worked with other brand SIP doorphones without any issue, as they...
  2. roelb

    Problem with Dahua OUTDOOR intercom VTO VTH and Asterisk: Retransmission timeout reached on transmission.

    I have exactly the same issue. Did you manage to find a solution? It seems that the SIP OK message from Asterisk is never ACK'ed by the phone, and thus a session is never established. In my setup, after the INVITE from the phone, my server sends back the following packet: SIP/2.0 200 OK Via...
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