All,
I'm haveing a bit of trouble getting my head around H.323 and call routing with
Gatekeepers, Zones and intra-zone calls - hopefully someone who is more
informed in things H.323 will be able to point me in the right direction...?
I already have a mature network of Asterisk boxes dotted around the UK and
overseas with hundreds of extensions and our own number-plan/dial-plan in the
form 8EEXXXX where 'EE' is a two digit "exchange number" and 'XXXX' is the four
digit extension number, so for example my desk phone (a Cisco 7970G as it
happens) at home is 8202001 and other phones around the house 8202002, 8202003
etc.
I have a Cisco 2621XM connection to the internet with NM-2V and some VIC-2E&M
cards and have my home Asterisk box hooked up to ham radio and other
interesting audio sources which I use Asterisk ooh323 to make H.323 connections
to the Cisco and its simple, reliable and just works.
I'm working on an R&D project with TETRA -- a digital trunked radio system --
the hardware of which comes from Damm Cellullar (www.damm.dk) and is called
TetraFlex - the system supports point-to-point (half duplex), group
comminication and PABX/PSTN interconnect via H.323. Further investigation
shows the system controller to be built on Windows-XP embedded and use the
OpenH323 stack to provide H.323 connectivity, however the use of a Gatekeeper
is mandatory in their set up.
So, I have the following:
- a network of Asterisk boxes using 8EEXXXX numbering with IAX2 between sites,
hundreds of SIP and SCCP phones
- a TETRA system using 'mobiles' that I have numbered 817XXXX to fit my number
plan, a H.323 setup that requires a Gatekeeper
- an Asterisk box (1.2.14 + asterisk-addons-1.2.5) on the same LAN segment as
the TETRA system with OOH323 compiled up and working
- the devices are as follows:
192.168.1.5 is the Asterisk box
192.168.1.6 is the Cisco 2621XM GateKeeper
192.168.1.7 is the Damm TETRA system
Where I am "stuck" is partly with the H.323 concepts and partly with the
implementation...
First I went in search of a H.323 Gatekeeper and tried to build the GNU GK from
source on another Fedora Core 6 box which turned out to be a nightmare (missing
libraries, the OpenH323 libraries appear to be deprecated in favour of Opal?
conflicting versions of pwlib, problems with yacc/bison building the ASN.1
parser, etc. etc.) so next I turned to Cisco. I have a spare 2621XM router
with c2600-jsx-mz.123-22.bin which includes a H.323 gatekeeper... great... so
I've configured it up (all three lines of it :o) so far:
!
gatekeeper
zone local TETRA tubby.org 192.168.1.6
no shutdown
!
and can get both Asterisk and the Damm TETRA equipment to register with the
Gatekeeper, like this:
router-h323-gw#show gatekeeper endpoints
GATEKEEPER ENDPOINT REGISTRATION
================================
CallSignalAddr Port RASSignalAddr Port Zone Name Type Flags
--------------- ----- --------------- ----- --------- ---- -----
192.168.1.5 1720 192.168.1.5 13030 TETRA UNKN-GW
H323-ID: PABX
H323-ID: Asterisk
E164-ID: 100
Voice Capacity Max.= Avail.= Current.= 0
192.168.1.7 1720 192.168.1.7 1085 TETRA UNKN-GW
H323-ID: DAMM
Voice Capacity Max.= Avail.= Current.= 0
Total number of active registrations = 2
router-h323-gw#
Over at the Asterisk box I have the following in ooh323.conf:
[general]
;Define the asetrisk server h323 endpoint
bindaddr=0.0.0.0
port=1720
gateway=yes
h323id=Asterisk
e164=100
gatekeeper = 192.168.1.6
[cisco-gk]
type=peer
ip=192.168.1.6
port=1720
context=from-h323
disallow=all
allow=alaw
allow=ulaw
allow=gsm
rtptimeout=60
dtmfmode=rfc2833
h323id=PABX
I have the Cisco document "Understanding H.323 Gatekeepers" available here:
http://www.cisco.com/warp/public/788/voip/understand-gatekeepers.html
While there is a diagram (top of page 10) in the Cisco document which appears
to show exactly what I want to make there's scant information on how to
configure it and hence its limited help with what I am trying to do, namely
gateway between two different H.323 gateways in a single zone and route calls
between the two gateways - for example:
Route Where Description
817.... TETRA to mobiles/portables on the Damm TETRA system
8...... PABX to numbers in the rest of my number plan
0. PABX through the PABX on to the PSTN
9.. PABX through the PABX to emergency 911/999
I can see how this be acheived if I had two Gatekeepers and two zones, say one
called "tetra" and one called "asterisk" by using zone prefixes and "zone
remote" to route between them and putting one of the gateways on each of the
Gatekeepers - but this appears to be over-the-top for what I want, ie. two
gateways on the same Gatekeeper at the same site, in the same zone, routing
calls between them...
Can anyone give me a clue where to go next with this?
Mike
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