I have a requirement where, after recording sessions using FS, I need to make a SIP call to a third party device, and then transfer the recorded file to it as part of this call. 

In order to accomplish this, my plan is to originate a call to this third party SIP device, and bridge the call to my extension, and the dialplan of my extension would playback the recorded file to the third party device.

Couple of questions:

1. Any other better ways of achieving this?

2. I also need to transfer the recorded file's metadata in the form of an XML, as part of the SIP INVITE to the device. Although I am aware of adding custom headers using "sip_h", I am not sure how to add a XML file as part of the SIP message.

Would appreciate any inputs

Thanks!