[Asterisk-Users] GnuGK -> Asterisk problem

[Michael Manousos]

Niclas Gustafsson wrote:
> Hi, i'm trying to setup Asterisk to work with GnuGK using the Openh323
> channel driver.
> 
> I have a Gatekeeper that gets H.323 calls from a Cisco GW.
> To this Gatekeeper I've registered some endpoints, Cisco ATA186, Snom
> 100, etc.
> 
> Now i want send the numbers 083xxx into Asterisk.
> 
> Easy, i'll just enter something like this into oh323.conf:
> 
> gwprefix=083
> 
> And all my calls starting with 083 to my gatekeeper gets routed into
> Asterisk context "voip-h323"
> 
> For the number 083111, the LocationRequest from Cisco GW to my
> Gatekeeper looks like:
> 
>     destinationInfo = 1 entries {
>       [0]=dialedDigits "083111"
>     }
> 
> However the fun starts when GnuGK returns a LocationConfirm which
> returns 
> the IP-address to the Asterisk but with the default Ep alias "ASTERISK" 
> 
>   destinationInfo = 1 entries {
>       [0]=h323_ID  8 characters {
>         0041 0053 0054 0045 0052 0049 0053 004b   ASTERISK
>       }
>     }
> 
> Which later is the ID sent to Asterisk so i loose the ability to map the
> extension.
> 

GnuGK has a section in its config file for handling
problems like these. I can't try it myself
but you should check the [RasSrv::LRQFeatures] section.

 From the GnuGK manual:
--------------------------
...
Section [RasSrv::LRQFeatures]
Defines some features of LRQ and LCF.
...
-> IncludeDestinationInfoInLCF=0
Default: 1
The gatekeeper replies LCFs containing destinationInfo and 
destinationType fields, the aliases and terminal type of the destination 
endpoint. The neighbor gatekeeper can then save the information to 
suppress later LRQs. However, some vendors' gatekeepers misuse the 
information, thus result in interoperability problems. Only turn off 
this option if you encounter problems upon communicating with a 
third-party gatekeeper.

-> CiscoGKCompatible=1
Default: 0
Include a NonStandardParameter in LRQs to compatible with Cisco 
gatekeepers.
...
--------------------------------


> 
> If i use the following oh323.conf instead:
> 
> context=prefixcs
> alias=083111
> alias=083112
> alias=083113
> alias=083114
> 
> All calls to the above 4 numbers will go inte the context "prefixcs". 
> However all will have the first registered alias 083111 as destination 
> number when comming into Asterisk (Cisco GW gets a LCF containing all
> numbers
> and chooses the first). Which makes any routing hard.
> 
> Even if this method would work, i believe there is some sort of limit 
> on how many alias an endpoint can have? Therefor i'd like to use the 
> "gwprefix" option.
> 
> Do i have to patch the GnuGK to copy back the LRQ-Dest into the LCF if 
> it's dealing with a Gateway? 
> This seems a bit harsh, Have i got everything mixed up?
> 
> I'm not a H.323 expoert so I don't know if someone is breaking protocol
> in 
> the chain Cisco GW -> GnuGK -> Asterisk.
> 
> Anyone with Ideas? Anyone using Asterisk with H323 support in a GW mode?
> 
> 
> Regards,
> 
> Niclas Gustafsson
> CodeSense AB
> 
> 
> 

Regards,
Michael Manousos.



> 
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