Chan_Sip follow me call confirmation bug Distro 7

We discovered a follow me bug that only seems to affect extensions that are using chan_sip. Makes it impossible for follow me's to call the right number and if you try to fix it then its impossible to confirm the call.

Scenario:

I created ext 100 and 1007 (Chan_SIP)

----------------------------------------

What seems to be going on is the following:

Ext 100:
[Follow me = 7781264589#]
[Call Confirm = On]

Ext 1007:
[Follow me = On/off]
[Call Confirm = On/Off]

If call confirm is on with ext 100 then it takes the first digit from the follow me and attaches it onto its call confirm extension. This removes the 7 from the dialed number so it dials "654184567" and sends a call confirm to extension 1007. Super weird right?

If you turn off call confirm on ext 100 then it properly calls "7781264589". This only seems to happen with chan_sip extensions.

Scenario 2:

I created ext 100 and 1007 (Chan_SIP) and added a 1 to the dialed number

----------------------------------------

Ext 100:
[Follow me = 17781264589#]
[Call Confirm = On]

Ext 1007:
[Follow me = On/off]
[Call Confirm = On/Off]

Adding a 1 infront of it allows the call to reach 7781264589 but the call confirmation is for ext 1001 now so you cannot confirm 100's call.

I made this happen with fresh extensions changing no settings but the follow me and the label of the extension.