When setting up our new ISDN-PRI service with the UC520-48U-T/E/I-K9, outgoing calls cannot go through, but receive incoming DID calls no problem.
I know its a PSTN setup issue, but do not know how to fix it.
Hi, it seems a bit strange that you use an uc520 with CM 4.2(3) - that is not IOS by the way.
The CA does not apply to this configuration.
If this is your first implementation with cisco telephony, suggest you hire somebody to help you out.