Sip proxy – 2N OfficeRoute - User manual, 1493 v1.9.0 User Manual
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Figure 3.70: GSM Routing - Normalising Adding Form
SIP Proxy
IP phones are registered to the internal SIP proxy. The SIP proxy serves as a registrar
and location server and also as an RTP proxy for outgoing SIP proxy calls (e.g. calls to
a SIP operator).
Figure 3.71: SIP Proxy Main Screen
Fig. 3.71 shows an example of a completed routing table that gets displayed when you
open the
item. Each row represents one rule. Having received a
SIP proxy
call-establishing request, the SIP proxy searches this table from top to bottom for the
appropriate routing rule.
Doing this, it compares the called destination with the value in the first table column. If
the called subscriber's identifier starts with the prefix included in the
field of
If prefix
the routing rule, the SIP proxy terminates searching and uses the rule found.
The last table row represents the so-called initial routing rule. It cannot be deleted. It
is applied to all calls for which no explicit routing rule has been found. The routing rule
defines what the SIP proxy should do with a call. It can reject it, forward it to another
host and/or port, transfer it to a gateway VoIP line (i.e. to the LCR), or search for the
called subscriber in the database of logged-in SIP telephones. Before one of the above
mentioned operations is executed, it is possible to modify the called subscriber's
identifier by removing a certain number of characters from the left or adding a new
string to its beginning (refer to the Remove and Add columns).
The SIP proxy routing rules define routing (according the prefix of the dialled number).
There are 2 rules by default - all dialled numbers with prefix 0 are routed to the
internal SIP line and the remaining are to be looked up for registered IP phones.