Nortel Remote Gateway 9110 Release Note page 16

Standard 1.0
Use of Speed Call feature
When you are using a Speed Call feature in conjunction with the Remote
Gateway 9100 Series product, you must configure the host PBX for Class of
Service CNDA for each TN. Configuring Class of Service CNDA ensures that
the Remote Gateway 9100 Series product does not incorrectly detect an
emergency 911 call.
16 1.6.0 Release Notes for Remote Gateway 9100 Series and RLC