-----Original Message----- From: Ericsson User [SMTP:etxjaeh@AL.ETX.ERICSSON.SE] Sent: Thursday, October 15, 1998 4:31 AM To: TIPHON@LIST.ETSI.FR Subject: Re: Gk-GK Call signalling
Jim, It was written into the scope of Annex G that the Annex is only about RAS.
An Example: If you have one Gatekeeper only. That Gatekeeper have a lot of information about the user. This information is non-standardized properties, e.g the language of the user, the maximum cost of a call to PSTN / minute etc ... further more the Gatekeeper has a lot of information about the Gateways e.g. the cost for breaking out to PSTN.
An other example is the phone-to-phone case when ISUP is involved on both sides. The following parameters are missing or can not be transported correctly: (i.e they are also impossible to re-generate in the Gateways)
Access delivery information Automatic congestion level Backward call indicators Call diversion information Call history information Calling party number (Presentation indicators can not be transported) Calling party's category Closed user group interlock code Connected number(Presentation indicators can not be transported) Connection request Echo control information Facility indicator Forward call indicators Freephone indicators Generic digits Generic number(Presentation indicators can not be transported if required) Generic reference Hop counter Information indicators @ Information request indicators Location number MCID request indicator MCID response indicator Message compatibility information MLPP precedence Nature of connection indicators Network specific facilities Optional backward call indicators Optional forward call indicators Original called number Origination ISC point code Parameter compatibility information Propagation delay counter Redirecting number(Presentation indicators can not be transported) Redirection information Redirection number(Presentation indicators can not be transported) Redirection number restriction Service activation @ Signalling point code @ Subsequent number Suspend/Resume indicators
There are also a number of Messages that cant be interworked.
/Best Regards Jan Holm
Jim Toga wrote:
Jan,
Being one of the contributors of some of the text.... There was no
intent
to limit GK-GK communications to RAS or Call Control. The plan of
attack
was to initially solve some specific issues with being able to complete Inter-zone calls.
The fact that the messages are carried in RAS format was simply a
straw-man
proposal. The content and logic was the important starting point.
As is always the case, this work moves forward with contributions.
What
specific functions do you want to acomplish? It might help me (and
others)
to understand where the specific holes are, in order to figure out what
the
next holes are (in the IP context) rather simply saying we need to port ISUP to GKs.
Best Regards, jimt.
At 01:39 PM 10/13/98 +0100, Ericsson User wrote:
Hello All, I participated in the SG 16 meeting in Geneva in september.
One thing that suprised me was that the ongoing work with Annex G
(GK-GK
signalling) did not consider call control, only the RAS signalling.
When I asked why, they did not understand why any change is required. After a while they understood that something could be needed, but it
was
postponed to future releases of H.323.
Future releases must be version 4 or something (around year 2001 or later ??).
The conclusion is then (looking on TIPHON project plan) that H.323
can't
be used between Gatekeepers in TIPHON compliant system.
The question is then: What do we use then? ISUP? B-ISUP? SIP? Extended subset of H.323?
/Jan Holm Ericsson Telecom AB
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