How to send outbound INVITE with tel: Request-URI in FreeSWITCH?

Hi,

I have a carrier requirement where the outbound INVITE must be sent in this format:

INVITE tel:27215554740 SIP/2.0

I’m using FreeSWITCH 1.10.10.

I tried using:

sip_invite_req_uri=tel:27215554740

sip_invite_to_uri=tel:27215554740

My bridge is:

bridge({sip_invite_req_uri=tel:27215554740,sip_invite_to_uri=tel:27215554740}sofia/gateway/YourProvider/27215554740)

But FreeSWITCH does not send the INVITE and fails locally with:

URL Error! tel: uri's not supported at this time

followed by:

DESTINATION_OUT_OF_ORDER

Is there any supported way in FreeSWITCH to send:

INVITE tel:27215554740 SIP/2.0

instead of:

INVITE sip:27215554740@... SIP/2.0

Do I need a specific trunk/gateway configuration, a FreeSWITCH configuration change, or a mod_sofia patch?

Any guidance or working example would be appreciated.

Thanks!