14215700-IG, Edition 15.0
May 2020, Original document
162
The following image is from a Spectralink IP-DECT Base Station which is being connected to a
switch (the traces is done by port mirroring the switch port):
The above image shows a situation with no incoming calls to handsets, but only the keep-alive sig-
nalling between server and base station.
When an incoming call is received in the Spectralink IP-DECT/Virtual IP-DECT Server, the server
will send a multicast packet. The multicast packet will contain the PP-ID of the handset. Each Spec-
tralink IP-DECT Base Station will receive this multicast packet, and then send the page through the
radio. If the handset is available on a given base, the handset will acknowledge the page. The Spec-
tralink IP-DECT Base Station will then send a unicast message back to the Spectralink IP-DECT/Vir-
tual IP-DECT Server. Hereafter, the call setup will be transmitted between server and base station
as unicast traffic.
Using Site Based Paging
Spectralink IP-DECT Base Stations can use site based paging in case you have defined two or more
site(s) for your location. For selecting site based paging as paging method, see
less Server Settings" on page 145
By default, the system will allocate a media channel on the media resource with the lowest load at
the time a call is initiated. This can, however, lead to network traffic patterns that are not optimal in
situations where base stations and media resource are located at different locations and/or in dif-
ferent networks.
To avoid this issue, it is possible to create sites (i.e. a site for each location) and assign the base sta-
tions and media resources to them. When allocating a media channel, the system will then prioritize
any media resources assigned to the same site as the base station handling the call, avoiding unne-
cessary RTP traffic over e.g. a WAN connection.
Though assigned to a site, the base stations are not forced to use that particular media resource
only, it just takes priority over the other media resources in the system setup. If no media channels
can be allocated on media resources in the local site, the system will attempt to allocate another
media resource.
Note:
Using site based paging, incoming calls are only sent to the site, where the handset was
last active, which reduce the load on both Spectralink IP-DECT/Virtual IP-DECT Server
and WAN.
Spectralink IP-DECT Server 200/400/6500 and Virtual IP-DECT Server One Installation and Configuration Guide
