fetch string representation of calling number presentation indicator
and numeric representation of type of calling number value.
* MailboxExists converted to dialplan function
+ * A new option to Dial() for telling IP phones not to count the call
+ as "missed" when dial times out and cancels.
CLI Changes
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for more information.
* Added rtpdest option to CHANNEL() dialplan function.
* Added SIPREFERRINGCONTEXT and SIPREFERREDBYHDR variables which are set when a transfer takes place.
+ * SIP now adds a header to the CANCEL if the call was answered by another phone
+ in the same dial command, or if the new c option in dial() is used.
IAX2 changes
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