Gatekeeper questions

[tarun.pahuja]

Folks,

Here is my senario. Would appreciate feedback. I am working on an example from cisco website.

CallManager----GK1-------GK2------Gateway

I have registered the CallManager to the GK1 using gateway controlled trunk. GK1 shows callmanager registered. GK1 and GK2 are talking to each other. Gateway (CCME) has phones attached to it and is also actining as a gateway and registring with GK2. I am using RAS. I can make calls from an IP phone connected to Gateway (ccme), but, unable to make calls from an ip phone connected to the callmanager to the other ip phone (CCME).

I have following questions:

1) What is the significance of gw-type-prefix?

2) do i need to specify the total zone bandwidth or by default it would consider it unlimited?

3) When the call comes to GK1 from GK2 how does it know what to do with the dial digits, and what to send to the callmanager?

hostname GK1

interface FastEthernet0/0

ip address 10.209.16.50 255.255.252.0

duplex auto

speed auto

!

gatekeeper

zone local zone2 cisco.com

zone remote zone1 cisco.com 10.209.16.51 1719

zone prefix zone2 703.......

zone prefix zone1 9...

gw-type-prefix 1#* default-technology

bandwidth interzone zone zone2 1

bandwidth total zone zone2 1

no shutdown

!

-----------------------------------------------------

Hostname GK2

interface FastEthernet0/0

ip address 10.209.16.51 255.255.252.0

duplex auto

speed auto

gatekeeper

zone local zone1 cisco.com

zone remote zone2 cisco.com 10.209.16.50 1719

zone prefix zone2 703.......

gw-type-prefix 1#* default-technology

bandwidth interzone zone zone1 100000

bandwidth total zone zone1 1000000

no shutdown

-----------------------------------------------------

Hostname Gateway

interface FastEthernet0/0

ip address 10.209.16.52 255.255.252.0

duplex auto

speed auto

h323-gateway voip interface

h323-gateway voip id zone1 ipaddr 10.209.16.51 1719

h323-gateway voip h323-id ccme

h323-gateway voip tech-prefix 1#

!

dial-peer voice 20 voip

destination-pattern .T

session target ras

!

gateway

timer receive-rtp 1200

!

!

telephony-service

max-ephones 3

max-dn 3

ip source-address 10.209.16.52 port 2000

auto assign 1 to 3

create cnf-files version-stamp Jan 01 2002 00:00:00

max-conferences 8

transfer-system full-consult

!

ephone-dn 1

number 9000

!

thanks

[tarun.pahuja]

folks,

In my previous post please ignore the bandwith settings, i tested my configuration with very large numbers for bandwidth and changed the config to what it looks now, just to make sure that CAC was working.

show gatekeeper enpoints commands only shows gateways registered, is there a command that shows me gatekeepers registered with a gatekeeper?

[RShrove]

Doesn't GK2 need a zone prefix for zone1?

zone prefix zone1 9...

[tarun.pahuja]

thanks it worked!!

I have a question, if i try to do the same thing on GK1, basically define zone prefic for both local and remote zone, it does not let me create a zone prefix for local zone, tells me something about e.164 registered number?? any ideas?

Thanks

[rnarayana]

Hello Tarun,

Here are the answers to your 3 questions.

1.What is the significance of gw-type-prefix? : There is something know as Technology prefix and zone prefix.Zone prefix is used with e164 address ( ie your phone number) and Technology prefix used when there is no e164 address.It is considered good to configure Tech prefix for routing when you have more than one zone.

gw-type-prefix : There are few things you can do with this command.a.If you configure with default-techonolgy as in your case then if the gatekeeper cannot find any resolution for a call request from a h323 device it will see if there is a default technology prefiz configured.If it is configured then the GK finds all the gateways that is registered with this techprefix and send the calls to these tech prefix.

b.Used with hopoff: This is case you say if a call request comes with some tech-prefix which gatekeeperI am supposed to send the calls.

2.By default the bandwidth is unlimited unless and until you specify.

3.When a call comes from GK2 to GK1: GK1 has gw-type-prefix 1#* default-technology .GK sees that there are no zone prefx configured .So it depends on the above command to resolve the call request.In this case ccm is registed with 1# and hence the call is sent to callmanager as it is a h323 id .

In the ICT you can specify how many digits to be used for callprocessing.GKsends all the digits to callmanager.

I hope this helps.

Thanks,

Radhika

[tarun.pahuja]

Radhika,

Excellent responce. One last question, when i tried to put the zone prefix for zone1 in GK1, router would not let me do it, it gave me error saying that is already had e.164 registration for you. Any ideas? where would the router get the e.164 registration based on my router configuration.

Thanks

[rnarayana]

Hello Tarun,

When there is an analog line like fxs port on the router and if you have configured something like

dial-peer voice 1 pots

destination-pattern 8000

port 1//0/0

then this registers to the gatekeeper as e164 address,To avoid this on the pots dial-peer you can add one command called " no register e164 ".

But in your case I don't think you have any fxs ports on the gatekeeper 1.

Try to gice the following command and see what are the endpoints registered with the gk1 .This will help us to troubleshoot

show gatekeeper endpoint

Thanks,

Radhika

[tpetzold_2]

By default CME will register the phone extensions with the gatekeeper. So it's telling you the CME router already registered those extensions with the Gatekeeper so you can't put in a conflicting zone prefix.

If you don't want CME to register the phones DNs you need to add the no-reg (both or primary) when you define your ephone DNs.

Example: Router(config-ephone-dn)# number 2345 no-reg primary

no-reg—(Optional) Specifies that this number should not register with the H.323 gatekeeper. Unless you specify one of the optional keywords (both or primary) after the no-reg keyword, only the secondary number is not registered.