Generating ringback tone to incoming callers ( for ISDN to SIP calls)
Problem
Generate ringback tone over ISDN lines for incoming calls.
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If the Vega DSL is configured as NT it will always generate the call progress tones. E.g. ringback and disconnect tones.
Typically wait_for_connect and user_progress configuration parameters should either both set to 1 or both set to 0.
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