User guide

SIP Telephony120
Voice over IP (VoIP)
trunks connected to the Forum 523/524. For operation as a SIP
server a MGW Interface Card is required.
Licence Assignment
The number of possible SIP subscribers is determined by the
number of licences purchased. In order to provide you with the
greatest possible flexibility regarding usage of available licences,
licence assignment is dynamic via the “Floating licence”. Using a
user/password combination (“SIP log on”) you can have several
SIP subscribers under the same call number. Only every new SIP
log-on occupies a new licence. The technical log-on process of a
SIP subscriber with a valid user name and correct password is
always successful. Only when a connection is established is there
an attempt made to occupy a licence under the SIP log-on. If all
licences are occupied currently, the SIP subscriber can only make
emergency calls.
Note: If the technical log-on is not successful due to an incorrect
user name or incorrect password, the SIP subscriber cannot
establish any connections – no emergency calls either.
When a SIP subscriber logs off, when terminating the programme,
for example, the associated licence will become available immedi-
ately. A licence is also made available when a SIP subscriber’s
regular status query is not conducted. The internal clock for auto-
matic log-out is determined by the Profile assigned under
Telephony: Devices: VoIP Phones. The (Keepalive) internal
clock setting is located on the Telephony: Extended: VoIP pro-
file page.
Detailed information on the current licence assignment and on
logged-on SIP subscribers is located on the System Info:
Telephony: SIP phones page. This page is where you can reset
licence assignment at any time by clicking on Reset licences.
Technical Notes
The names of settings for the various SIP telephones or SIP pro-
grammes are not uniform unfortunately. Please refer to the
(Help) on the Telephony: Devices: VoIP Phones page and the
following notes when configuring SIP subscribers:
z The “REGISTER” SIP message must be sent to the IP address
of the Forum 523/524 using the 5060 destination port. For SIP