A couple of suggestions:
To pass DID number (which is different form SIP ID), you need to use a VSP that allows you to specify the outgoing CID through verification or otherwise. Eg. Betamax, or les.net. This applies for PSTN calls only.
To pass a pseudo version of the DID in SIP-SIP calls, you can use the "Name" field in your SIP client or device. The called party will only see this if their SIP device allows both "Name" and number to be displayed.
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