Asterisk Refer-To tel: v/s sip:

Hi,

So I understand that Asterisk does not support out of the box REFER to go out the Asterisk. However, with a custom dialplan, I am able to do so by using the Transfer function

Now, I’d like to send a REFER out the Asterisk with Refer-To value in the format:

Refer-To: tel:+17031111111

Notice the tel: instead of sip:
RFC3966 Tel URI

Any ideas on how to achieve this if at all possible with Asterisk 16?

Some additional information which may or may not be helpful

Using chan_sip
FreePBX 15
Asterisk 16.12

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