2N OfficeRoute - User manual, 1493 v1.9.0 - Manual (Page 55)

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2N TELEKOMUNIKACE a.s., www.2n.cz
®
Within VoIP Network
Speaking of routing within a single VoIP network, we think of the activity executed by
the PBX whenever a registered user initiates a new call. The result of this process is a
route to another registered user based on the called number analysis. The called
number can be an IP telephone, GSM gateway, PSTN gateway, another VoIP PBX, etc.
Figure 3.35: Call Routing by VoIP PBX
The routing options are dependent on the capabilities of the particular PBX. For
SIP-based telephones, a SIP proxy server built in 2N OfficeRoute/2N VoiceBlue
® ®
can be used as a PBX. Enterprise
From VoIP to GSM
On coming to an VoIP line, a call 2N OfficeRoute/2N VoiceBlue Enterprise
® ®
proceeds to the Least Cost Router (LCR). The LCR decides which line the call shall use
for going out. The decision depends on the called number and LCR settings.
Figure 3.36: Routing of Incoming Calls from VoIP
Although the Least Cost Router is, as its name suggests, designed primarily for
searching the most cost-efficient route to a GSM network, it is not limited just to this
function. Generally, it can interconnect incoming calls from VoIP lines to any lines that
are available in the gateway regardless of their types. This is very useful for
interconnecting heterogeneous VoIP networks, such as SIP and H.323 environments.