Add call transfer exchange of subaddresses support and fix PTMP call transfer signaling.
* Add the ability to exchange subaddresses for ETSI PTMP, ETSI PTP, and Q.SIG for call transfer. * Fix ETSI PTMP to send the correct messages depending on the call state for call transfer. NOTE: Some ISDN phones only handle the NOTIFY message that the EN 300-369 spec says should be sent only if the call has not connected yet. JIRA LIBPRI-47 JIRA SWP-2363 Review: https://reviewboard.asterisk.org/r/1051/ git-svn-id: https://origsvn.digium.com/svn/libpri/branches/1.4@2172 2fbb986a-6c06-0410-b554-c9c1f0a7f128
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