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It is up to the channel technology to determine when to act upon connected line updates before the call is answered. ISDN will just store the updated information until the call is answered. SIP will could immediately update the caller with a Re-INVITEprovisional response or wait for some other event to notify the caller.

Since the connected line information can be sent while a call is connected, you may need to prevent the channel driver from acting on a partial update. The 'i' option is used to inhibit the channel driver from sending the changed information immediately.