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Maybe try one of the following on the trunk that faces the soft switch:
voice trunk T01 type sip
match ani $ add p-asserted-identity 2605551212
match ani $ replace diversion 2605551212
Thanks cj!, I will try them.
Looks like it might not be an outbound ANI issue but a setup message issue btween the PBX and the ADTRAN/softswitch. I will pull some logs and maybe ask for more help.
I found this Adtran PDF very useful for adding headers or changing headers from PRI to SIP so the SBC would be satisfied.
Manipulating SIP Headers and Messages in AOS