IP Office 500v2 ver11.0 Outgoing ID for 911 with Adtran 908e

[TIgerV]

I have the above system, connected PRI to an adtran 908e SIP gateway.
Whenever I call 911 from certain extensions, it send the header FROM: 911@<sip domain>. TO:911@<sip domain>. All other calls go out with the proper caller ID. eg: 26012345486@<sipdomain>.
ONE extension calls 911 properly with the proper caller id.
Problem is that the SIP provider rejects the outgoing FROM header.
I know the Adtran is getting the outbound caller ID from the IPOffice, but where do I make it so that it has the proper header?
Can I tell the Adtran "When you see 911 as callerid change it to xxxxxxxxxx"?
I have tried MANY combinations, and just can't get it. Further, I see NO difference in the one station that works and the others.

 

[Firebird Scrambler]

It might be worthwhile posting your qu ery on the IP Office forum at.. https://www.tek-tips.com/forums/avaya-ip-office.940/