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With VoiceXML you cannot do a blind transfer (<transfer bridge="false" ....>) over PRI. The call can come in over PRI, but you must set the outdial signaling group transfer parameter (client.tel.outdialgroup in the default.cfg file) to a signaling group that is line-side T1, loop start T1, line-side E1, or loop start E1. Note that the entire signaling group used for the transfer must be line-side T1, loop start T1, line-side E1, or loop start E1, since any available resource in the signaling group could be used for the transfer.
For bridge transfer (<transfer bridge="true" ....>), PRI is supported.
For Voice over IP, bridge transfer (<transfer bridge="true" ....>), is not supported for VoiceXML applications.
When using the <transfer> element, the destexpr attribute supports the tel URL scheme defined in the Internet standard RFC2806, "URLs for Telephone Calls." For more information, see http://www.ietf.org/rfc/rfc2806.txt.
