Re: HELP: Urgent _IPSP Model

Saraswati,

There is no difference between the SGP/ASP model and the IPSP SE model.

--brian

Saraswati Bose wrote:                                                            (Mon, 17 Oct 2005 00:21:21)
> 
>    Hi
>        I  am  a  new member of SIGTRAN mailing list. I work as a protocol
>    Testing Engineer in Nethawk Networks India Pvt.Ltd.
> 
>    I need urgent help for IPSP model implementation in SIGTRAN.
>    The "draft-pastor-sigtran-m3ua-ipspcomm-00" or RFCs are not very clear
>    about the same.
> 
>    Please  help  me in the below queries in reagard to the IPSP/IPSP call
>    flow showed in RFC-3332.
> 
>    Section 5.5.1 Single exchange:
> 
>    
>    IPSP-A                                        IPSP-B
> 
>    |                                                        |
> 
>    |-----------------------ASP Up------------------->|
> 
>    |<------------------ASP Up Ack-----------------|
> 
> 
>    |<------------- ASP Active(RCb)---------------|
> 
>    |-----------ASP Active Ack (RCb)---------->|
> 
>    |                                                       |
> 
>    |                                                       |
> 
>    |<========= DATA (RCb) =======>|
> 
>    |                                                        |
> 
>    |<-----------ASP Inactive (RCb)---------------|
> 
>    |-------------ASP Inactive Ack (RCb)------>|
> 
>    |                                                        |
> 
>    |<------------------ASP Down--------------------|
> 
>    |----------------ASP Down Ack--------------->|
> 
>    |                                                        |
> 
>    Q1: How is client server mode achieved in IPSP SE model since both can
>    initiate Request and response? Please refer the above call flow.
> 
>    Q2:  As per the above call flow, can IPSP-B send NTFY message followed
>    by UPACK and also IPSP-A send NTFY message followed by ACTIVEACK?
> 
>    Q3:  As  per  the above call flow, after DOWN procedure can any of the
>    two communicating ASPs initiate UP procedure? If yes then what if both
>    try  to  initiate  UP  simultaneously?  If  no then what error will be
>    ncoded for receiving UP from the non permitted IPSP?
> 
>    Q4:  Is  it  a problem if IPSP-A intiates INACTIVE procedure though it
>    has not intiated ACTIVE in first place? if yes then what type of error
>    is expected?
> 
>    Q5: Is  it a  problem and if yes then what error is expected if a IPSP
>    sends a request message for which it has sent a response message in SE
>    model?
>    For  EXM: In  above  call flow what if IPSP-A sends a inactive message
>    followed by inactiveack message.
>    If no then how does SE mode differs fron DE mode operation?
> 
>    Q6:  Should we mandate 4way message exchange for a procedure (like UP,
>    ACTIVE  etc.)  in  DE model? If yes then should there be absolutely no
>    restrictions  in terms of REQUEST / RESPONSE message processing by the
>    two communicating IPSPs in DE model?
>    
>    Once  I  get  appropriate  answers  for the above queries I can try to
>    get a  clear  picture  of  difference between ASP/SG model and IPSP SE
>    model. This is important. 
>    
>    Thanx and Regards,
>    Saraswati.
>    
>      _________________________________________________________________
> 
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> 
> References
> 
>    1. http://pa.yahoo.com/*http://us.rd.yahoo.com/evt=36035/*http://music.yahoo.com/unlimited/

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-- 
Brian F. G. Bidulock
[email protected]
http://www.openss7.org/