Reference13r1:Concept Reverse Lookup

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There are also other versions of this article available: Reference13r1 (this version) | Reference13r3

With the reverse lookup feature the PBX does the lookup of calling or called numbers in an external directory so that not each endpoint has to do the same lookup again. The result of the lookup is sent to the endpoints using name id facilities and is stored in the CDRs so that it can be displayed in call lists.

Reverse lookup can be user specific (see %u placeholder below). For this reason, it is done separately for each user destination of a call. For example, a call to a waiting queue with two active agents is looked-up 3 times, once for each agent and one for the waiting queue itself.


Available since 13r1 release


For reverse lookup there are two configuration parameters: The LDAP URL as command line parameter at the PBX and a encrypted VAR for the LDAP password:

Command line parameter for the LDAP URL according to RFC 2255
The VAR for the password

In short the format of the URL is as follows:

The path in the LDAP directory, e.g. dc=entries
The list of attributes to be returned, e.g. givenname,sn,company
The scope. Could be base, one, sub
The LDAP filter used for the search, e.g. (metaSearchNumber=+%n) (for the meaning of %n see below)
Used for the bind name, e.g.\contacts

Inside the LDAP URL placeholders can be used, which are replaced by the actual information:

The number which should be looked up. It is provided in e.164 international format with no prefixes nor '+' at the beginning (e.g. 497031730090)
The H323-Id (SIP URI) of the user on behalf of which the lookup is performed


The result of the lookup is stored in the CDRs as the results of the lookup are available, so the events for the lookup results are not necessarily next to the related events. To allow matching of the reverse lookup result to the looked up number in the event the name and as reference the looked up number is stored. The event in the CDR is formatted as follows:

<event msg="lookup">
  <ep e164="<reference number>" dn="<looked up name>"/>

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