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Routing Clear Channel VoIP Calls
Overview
The following examples show the host application initiating Clear Channel VoIP Calls using the VDAC-ONE card but without running SIP or H.323 software.
The following are two examples of API messages that cause the CSP to initiate a clear channel VoIP call. Even though the examples use different API messages, they perform the same function.
00 4c 00 e8 00 00 ff 00 01 29 02 ff fe 02 02 1e 16 00 03 00 13 00 02 00 09 00 0f 00 01 0b 00 09 00 05 0d 03 00 40 03 03 00 33 00 22 00 04 27 92 00 04 87 77 33 b2 27 93 00 04 00 00 17 70 27 94 00 04 87 77 33 b7 27 95 00 04 00 00 17 78
Outseize Control message
00 34 00 2c 00 00 ff 00 01 0d 03 00 40 03 01 03 00 33 00 22 00 04 27 92 00 04 87 77 33 b2 27 93 00 04 00 00 17 84 27 94 00 04 87 77 33 b7 27 95 00 04 00 00 17 88
These messages require the host to manage the IP call signaling and to map the VDAC-ONE spans and channels to the correct IP resources (VDAC-ONE IP addresses and ports).
IP Endpoint Signaling
The following example involves host-to-host signaling (also called IP endpoint signaling).
1. A call from the PSTN comes into CSP A, which sends a Request for Service with Data message to Host A.
2. Host A notifies Host B (or an endpoint directly) of a call request using any protocol.
3. The call request contains the IP address and port number of a resource on the VDAC-ONE card (those IP addresses and ports must be managed by the host in this example).
4. The Host B side responds to the call request with the Host B side
parameters: IP address and port.
5. Host A issues a Route Control or Outseize Control message to CSP A supplying the local and remote VDAC-ONE IP and port address (as well as the correct span/channel) to initiate a VoIP clear channel call from the VDAC-ONE card.
6. Host B issues a Route Control or Outseize Control message to CSP B to complete the IP call.