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Practical VoIP Using VOCAL by Luan Dang, Cullen Jennings, David Kelly

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Call Progress Timer

This tag allows the UA to time out a call initiation if the receiving end is unresponsive:

Ua_Timeout              string          10
Ua_Timeout

Specifies a limit (in seconds) on the amount of time it takes to receive a response (other than 100 Trying) from the UA server at the far end of the network

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