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No ring back tone on external call forward

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sunspark

sunspark

IS-IT--Management
Oct 5, 2012
53
FR
when forwarding incoming SIP to an external number via SIP, call will connect with two way audio but during the connection there is no ring tone just dead air until it connects. Any thoughts?
only mobile destination.

any idea ?
 
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in the sip peer profile/SDP Options, set the following parameter:
''Ignore SDP Answers in Provisional Responses'' to YES:
 
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