FW: ITU Website feedback (Recommendation H.450.4 call hold

OKUBO Sakae okubo at mxz.mesh.ne.jp
Thu Mar 8 21:15:19 EST 2007

Dear all,
for your consideration.

-----Original Message-----
From: neil.seymour at selex-comms.com [mailto:neil.seymour at selex-comms.com]
Sent: mercredi, 7. mars 2007 17:10
To: Sales, ITU; Sales, ITU
Subject: [form2email] ITU Website feedback (recommendation H.450.4 cal hold supplementary service)
Importance: High

 This mail has been sent from the ITU web site to sales at itu.int :


ITU Website feedback








Neil Seymour


Recommendation H.450.4 cal hold supplementary service




I have some suggestions/corrections to submit regarding H.450.4. Perhaps you would be kind enough to forward this to the appropriate department as necessary? 
I\'ll start with a very minor suggestion: 
1) It might be better to title section 11 as \"Dynamic description for call hold\" because sub-section 11.1.1 covers \"Near-end call hold\" and 11.1.2 covers \"Remote-end call hold\", thus section 11 covers both near-end and remote-end call hold. 
2) If a new state called \"Hold_RE_Holding\" were introduced, this could simplify a state machine\'s implementation because it would prevent a held User retrieving the held call because the remoteRetrieve.req would then only be accepted when in the Hold_RE_Holding state. Thus only the served user would be able to retrieve the call. 
3) Figure 18a refers to state Hold_RE_Held at the holding side and shows that if the served endpoint sends a remoteHold.req primitive then the state changes to Hold_RE_Retrieve_Req even though call retrieval has not been requested! I would have anticipated that the state would remain unchanged and so the state machine would still be waiting to receive a valid remoteRetrieve.req primitive. 
4) Figure 18b in the central branch receives a remoteRetrieve.rr message. (This eventuality is already covered by the left hand branch.) It ought to say \"remoteRetrieve.re\" for a Return Error APDU. 

Yours faithfully, 
Neil Seymour

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