My PBX registered in bulk to Kamailio successfully.

PBX --> Register --> kamailio
PBX <-- 401 with nonce value <-- kamailio
PBX --> Register with nonce and md5 response values --> kamailio
BOX <-- 200ok <-- kamailio

However, when one of the PBX client sends an invite out, kamailio AUTH module does not authorize this client:

client (813-111-1111) --> Invite --> kamailio

What would be the right way to authorize a 10-digit client to send a call out when a bulk registration and not 10-digit registration is performed. 

Your assistance in this matter is greatly appreciated

Thanks,
Al