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1) This commit adds the ability to override the To: header so you can place an outbound SIP call to a paticular destination. For instance, if you have a user registered to your machine as 'gateway' and you want to call another extension at that machine 'foo' you can now call: sofia/mydomain.com/gateway:foo@anydomain.com or if you just want to call some SIP url and put an alternate To: so you can do forwarding: sofia/mydomain.com/1000@somwhere.com:12122551234@realdest.com 2) You can add headers to outbound SIP calls by prefixing the string 'SIP_h_' to any channel variable: <action application="set" data="SIP_h_X-Answer=42"/> <action application="bridge" data="sofia/mydomain.com/1000@somehost.com"/> 3) All inbound SIP calls will install any X- headers into local variables this means in conjunction with item 2, all X- headers will pass across bridged calls auto-magicly. 4) The switch_ivr_transfer_variable function in switch_ivr.c has been modified so if the last arguement 'var' starts with a ~ it will copy anything that is prefixed with that string rather than an exact match. *NOTE* you are not required to put an X- prefix in the SIP_h_ vars but it is reccommended because most SIP devices will ignore any unknown headers that don't. git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@4216 d0543943-73ff-0310-b7d9-9358b9ac24b2
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