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Cisco Gateway Configuration with MaxCS
Be aware of the following when configuring MaxCS to work with Cisco gateways.
For MaxCS to communicate with a Cisco Gateway with TLS, you should set the SIP Tie Trunk’s SIP Destination Port to 0. (This is a field in the SIP Group configuration panel, on the Register tab.) This means that MaxCS will reuse the existing TLS connection established from the Cisco Gateway.
You will need to turn on the SIP Option or TCP keep alive option on the Cisco gateway to maintain the TLS connection.