Avaya Interaction Center, Programmer'S Manual

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Communicating with other applications
30 VTel Programmer Guide
Socket usage
Generally, VTel uses three (3) TCP sockets, one each for:
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the Telephony Server
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the EDU Server
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a default Telephony session.
If an agent has more than one phone number, one (1) additional socket is required for each
additional phone number. Socket connections for additional sessions are created and
destroyed as needed.