hi,
I would assume that this is from PSTN --> OSBC --> Sipx, if this is the case, point your DID number to your OSBC then from OSBC create a route going to sipx.
ex.
DID number(123456789) --> OSBC (route would be, [sip:123456789*] sip:10...@si... ) -->SipX
with the example above, when an incoming call is received by the DID number, it will go to osbc then applied the specified route,which is going to sipx AA (as implied by 100 ext),
raymund
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