Can someone please explain the exact mechanism that a Lync client uses for Reverse Number Lookup.

For example, when a call comes in from the PSTN or a PBX: what is the process for resolving the incoming number into a name that is displayed to the called Lync user. Probably the first source for the reverse number lookup is the Lync addressbook. After that, which contact name takes precedence, the one in Outlook contacts or the one in AD? What does actual happen during the RNL process? What about number formats? Do they always have to be in e.164 format or does Lync try to do some sort of mapping of the incoming number to different number formats?
Is there any document or Link that describes this in detail?

Many Thanks and best regards,
Hanno98

Hi,

When a call comes in from the PSTN or a PBX, base on my understanding, the name of the caller will be checked firstly by the contact in AD, then by the contact in Outlook. If none of them lookup the name, then it will show the tel number of the caller on the called Lync client.

For the caller number from PSTN or PBX, as I know, Lync Server side will not perform normalization rule for the incoming number, but the called number.

Best Regards