failed call

  1. 603 error for only 1 number

    I’ve had 3CX for a while, but I haven’t encountered this problem before. I can successfully call any phone, except for my own cell have phone. I am using Twilio and don’t see anything in the Twilio logs, but I am getting this in the 3CX logs: Unknown IS handler: UnkISH Recv 603/INVITE from...
    • ASofNWAugusta
    • Thread
    • 603 error failed call outgoing call blocked twilio trunk
    • Replies: 1
    • Forum: 4SC

  2. Calls from our 3cx to a customer 3cx fail on transfer

    The situation is that if we call just one of our 3cx customers, the phone rings fine and is able to be picked up. However, when someone on the other end attempts to transfer us to another user, we then start to hear our own 'On hold' music. If I watch the customers 3cx dashboard I see this as an...

  3. Call shown as failed since V20 upgrade

    Hello, since upgrading one of our customers to V20 we are having some problems with calls which should be declined. In this example the caller called an extension directly. This extension was not available and these settings should apply: And the log is showing the following, with the error...
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