Version 5.6
367
November 2008
SIP User's Manual
7. IP Telephony Capabilities
Field Name
Description
RTPdelay
RTP Delay
RTPjitter
RTP Jitter
RTPssrc
Local RTP SSRC
RemoteRTPssrc
Remote RTP SSRC
RedirectReason
Redirect Reason
TON
Redirection Phone Number Type
MeteringPulses
Number of Generated Metering Pulses
NPI
Redirection Phone Number Plan
RedirectPhonNum
Redirection Phone Number
7.12 Trunk-to-Trunk Routing Example
This example describes two devices, each interfacing with the PSTN through four E1
spans. Device
A
is configured to route all incoming Tel-to-IP calls to Device
B
. Device
B
generates calls to the PSTN on the same E1 trunk on which the call was originally received
(in Device
A
).
Device
A
IP address: 192.168.3.50
Device
B
IP address: 192.168.3.51
The
ini
file parameters configuration for devices
A
and
B
include the following:
1.
At both devices, define four trunk groups, each with 30 B-channels:
•
TrunkGroup_1 = 0/1-31,1000
•
TrunkGroup_2 = 1/1-31,2000
•
TrunkGroup_3 = 2/1-31,3000
•
TrunkGroup_4 = 3/1-31,4000
2.
At Device
A
, add the originating Trunk Group ID as a prefix to the destination number
for Tel-to-IP calls:
AddTrunkGroupAsPrefix = 1
3.
At Device
A
, route all incoming PSTN calls starting with prefixes 1, 2, 3, and 4, to the
IP address of Device
B
:
•
Prefix = 1, 192.168.3.51
•
Prefix = 2, 192.168.3.51
•
Prefix = 3, 192.168.3.51
•
Prefix = 4, 192.168.3.51
Note:
You can also define Prefix = *,192.168.3.51, instead of the four lines above.
4.
At Device
B
, route IP-to-PSTN calls to Trunk Group ID according to the first digit of the
called number:
•
PSTNPrefix = 1,1
•
PSTNPrefix = 2,2
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