Snom VoIP PABX - Manual (Page 16)

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Using IM Clients with the PABX
Some models of PABX unit contain a full XMPP server which can
be used to exchange instant messages and presence information
with other users of the PABX using a suitable IM client. The PABX
may then be used as a unified communication appliance with full
synchronisation of presence between phone, OCM and IM client
devices.
Setting up an IM Client
In order to access the PABX, there must be IP network connectivity
between the PC that is running the IM client and your PABX. This
is normally the case if they are on the same LAN, but may require
a VPN or specific firewall or router settings if you are on a different
or remote network. This should be verified with your system
administrator.
The PABX should interoperate with any standard XMPP client, the
following setup instructions are therefore general and do not apply to
any specific client software.
In order to use IM, you must have a user account name and password
on the PABX. This will be supplied by your system administrator or
installer.
XMPP Server settings
An XMPP IM client should present at least the following setup fields
to allow you to connect to your account on the PABX.
User-ID (sometimes called Jabber ID): enter username @ pabx-
domain-name for this field in your client. username is your
PABX web username, and pabx-domain-name is the domain
name as supplied by your system administrator (normally used
to access the PABX web-UI from a browser).
Password: enter your PABX web-UI password .
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On some (typically remote) installations your PABX domain name
may not resolve to an IP address and you may instead have been told
to access the PABX by IP address instead. In these circumstances
you should still enter the domain name after the @ sign in the User-
ID but need to go to the Advanced or Connection settings of your IM
client and enter enter the PABX IP address and port number  as
the connection address in order to connect.
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Do not enter an IP Address after the @ sign in the User-ID, this will
not allow the client to authenticate with the PABX.