would you please show me the documents about what are the requirements to have caller ID over SIP trunk? does SP need to support and pass caller ID or we can do something internally in CME to pass caller ID?
By default, passing a caller ID and name display to and from SIP phones is enabled. Scenarios include SIP-to-SIP, SIP-to-SCCP, SCCP-to-SIP, SIP-to-H.323 (trunk only), and H.323 (trunk only)-to-SIP is enabled.
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