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1. Single Server Mode
In this mode, only one SIP registration is used for single or multiple-line operation. Please make sure that
your SIP server supports multiple-line operation and the SIP account is configured in the SIP server to
match the number of lines available in the device. Call routing to a GSM channel is now based on the
Routing Prefix
of each GSM channel. Here is the channel selection algorithm.
a) All
Routing Prefixes
are set
- Try to match the number received for making an outgoing call against the
Routing Prefix
of
each channel. If only one match is found, the corresponding channel is used to make the
outgoing call. If more than one matches are found, the best available channel among the
matched channels is selected. If no match is found, the call is rejected by sending back a SIP
503 message.
b) Only some
Routing Prefixes
are set
- Try to match the number received for making an outgoing call against those
Routing Prefix
es
that are set. If only one match is found, the corresponding channel is used to make the
outgoing call. If more than one matches are found, the best available channel among the
matched channels is selected. If no match is found, an idle channel without a Routing Prefix
is used to make the call. Otherwise, the call is rejected by sending back a SIP 503 message.
c) None of the
Routing Prefixes
are set
- An idle channel is selected to dial out the call. If no idle channel is available, the call is
rejected by sending back a SIP 503 message.
It is important to note that the Routing Prefix (P) must be removed via the dial plan before the number is
dialed out. The dial plan syntax to remove the Routing Prefix is "P:-P|". Please refer to section 3.3.6 for
more information on the Call Out Dial Plan.
Summary of Contents for GoIP
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