How to put a pause in the "tel:" tag?

Question

Asterisk

It is necessary to glue the extension to the phone number in html, I do this:

<a class="lc"  href="tel: [phone]p2">Звонить!</a>

When you click on the "a" tag, a number is transmitted to the phone in the following form: "88007008000 7 2" The extension
is not transmitted correctly, it is replaced by the number "7".
How to implement extension transfer?

Answer 1

No, pauses were removed in December 2004. https://tools.ietf.org/html/rfc3966

Answer 2

A comma-separated append might work, but it's not accurate