[Asterisk-Users] ISDN transfer, handoff to masterswitch

[Alex Mack]

Hi Peter!

Thanks for the quick response.

So I'm already doing ECT by using the bristuff'ed version of *?

Alex Mack

Peter Svensson schrieb:

>On Wed, 4 May 2005, Alex Mack wrote:
>
>  
>
>>I've setup * with a Junghanns.net QuadBRI card agaisnt an Ericsson 
>>MD-110 PBX. All four ISDN channels are setup to simulate  EuroISDN 
>>Point-to-Point ("Anlagenanschluss" in Germany) from the Ericsson's side. 
>>Works well and I have had little problems at all.
>>
>>Now what's happening during a call transfer of an ISDN call to another 
>>ISDN destination? Does such a transfer block 2 b-channels (one in and 
>>one out)? Or is it automatically handed off to the Ericsson so * is out 
>>of the loop? Is EuroISDN capable of such a handoff? Or do I have to use 
>>another protocol like Q.SIG for that feature?
>>    
>>
>
>In EuroISDN this functionallity is provided by ECT (Explicit Call
>Transfer) for established calls and CD (Call Deflection) for calls in the 
>setup phase. Bristuff supports these according to the documentation.
>
>Q.SIG has one (or possibly several) ways of doing this. At least one of 
>these have been implemented in libpri. 
>
>  
>
>>I don't have experience with Q.SIG at all. I was happy * worked with the 
>>EuroISDN trunk so well. But there's the issue with congestioning the 
>>link to the PBX with too many (in my case 4) forwarded calls.
>>
>>Does anyone have experiences with this? Are there references for Q-SIG 
>>out there?
>>    
>>
>
>I think at least some of the standards are published at
>http://www.ecma-international.org/activities/Communications/QSIG_page.htm
>
>Peter
>
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