You're making a mistake here. You're assuming that "p" means something other than "p". That was true (kind of) when you're connected to POTS. It does not mean anything in SIP/skype world. "+16045555555p333" is an identifier. If I want to call "+16045555555p333@my.domain", I want to call exactly that address. There is no pause, because p is just a normal character. These uri-s are completely legal and completely different: "sip:+16045555555p333@my.domain" "sip:+16045555555@my.domain" "sip:some_string_with_letter_p_and_others@my.domai n" The same thing is probably acceptable in skype. What you're asking to implement would break existing, correct functionality. That's why it cannot be "fixed".