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Conference irocz::common_brouters

Title:Digital Brouters Conference
Notice:New common-code brouter family: RouteAbout, DECswitch 900
Moderator:MARVIN::HARTLL
Created:Mon Jul 17 1995
Last Modified:Fri Jun 06 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:929
Total number of notes:3736

788.0. "ISDN signalling?" by TKOVOA::NAKANO_K (Koichi Nakano/NPB/Japan) Fri Mar 07 1997 07:36

Hello,

How is the RouteAbout work in following situation?

	ISDN network ------------------------->	RouteAbout
			SETUP with facility information element

		     <-------------------------
			ALTER/CALL PROC    ?
			STATUS             ? 
			REL COMP           ?

			* which signal does RouteAbout send out?

Japanese Carrier service said Router must send response ALTER/CALL PROC 
signal to network after accepts SETUP signal with facility information 
element (element identifire is 00011100), if we would like to use the 
router with carrier's ISDN optional service.


Thanks in advance.

Koichi Nakano
T.RTitleUserPersonal
Name		DateLines
788.1MARVIN::CLEVELANDMon Mar 10 1997 08:586
    Can you clarify the problem?  Depending on the setup we might do
    different things in different situations.  It sounds like you have
    tested the RouteAbout, and it is not accepting a call with
    the special optional facility specified?  What is this facility?
    
    Tim
788.2TKOVOA::NAKANO_KKoichi Nakano/NPB/JapanMon Mar 10 1997 10:0948
Thank you for your reply, Tim.

>    Can you clarify the problem?  Depending on the setup we might do
>    different things in different situations. It sounds like you have
>    tested the RouteAbout, and it is not accepting a call with
>    the special optional facility specified?  

No, I have not tested, yet. I do not know RouteAbout can accept or not.

>    What is this facility?

'facility' is proper name of information element in SETUP signal. I don't 
know this name is standard or original of Japanese carrier, NTT. By a protocol 
handbook, ISDN Q.931 frame format is following.

	8  7  6  5  4  3  2  1 bit
	+----------------------+
	 Protocol Discriminator		1 octed
	+----------------------+
	 Length Of Call Reference	1 octed
	+----------------------+
	 Call Reference	Value		1 or 2 octed
	+----------------------+
	 Message Type			1 octed
	+----------------------+
	 Information Element 1
	+----------------------+
	 Information Element 2
	+----------------------+
		:
	+----------------------+
	 Information Element N
	+----------------------+

Message type of SETUP is 0000 0011(8th to 1st bit). And set up signal can 
have some information elements. 'facility' means 'invoke and operate 
additional service', code is 0001 1100 (8th to 1st bit).

My first write is the message from carrier said. I think SETUP signal contain 
'facility' information element. 

Cisco's router can not accept it, and can not use this carrier's additional 
service. I think RouteAbout would have a advantage in Japanese market area, 
if it work with this additional service.


Koichi