Experts,

Could someone clarify following aspects of H.235 V2 Annex D (Baseline Security Profile). 1) Section D.2, last but second paragraph (This profile defines to....). According to this paragraph, the generalId field shall be set to the "called endpoint ID" for H225 signalling messages. Since the calls must be GK routed, shouldn't the generalId refer to the gkId for 225 messages sent by endpoints? Even if it is the called epId, how the peer endpoint can ever know the called epId, since it does not appear ARQ/ACF messages? Section D.10 throws some insight into the usage of senderId and generalId, but it does it so only for RAS messages.

2) Section D.9.1 of H.235 V2 states the 225 UUIEs which shall contain cryptoTokens field. H.323 V4 has added new UUIEs (Status, Status Enquiry,...). Does that mean that H.323 V4 can not possibly use H.235 V2?

best regards Manoj Paul.

-----Original Message----- From: ssilvy@hss.hns.com [mailto:ssilvy@hss.hns.com] Sent: Thursday, May 31, 2001 9:26 PM To: mpaul@TRILLIUM.COM; ITU-SG16@mailbag.cps.INTEL.COM Subject: Re:

Hi,

In case of initial RRQ when EPID is not available the table D.10 in H235v2 says that sendersID would be NULL. So the hash would be calculated with sendersID as NULL when the identification information i.e EPID is not available as in initial RRQ.

Silvy.

Nagesh Kumar B V 06/01/2001 10:40 AM

To: Silvy Samuel/HSSBLR@HSSBLR, Ivan T Varghis/HSSBLR@HSSBLR cc:

Subject:

---------------------- Forwarded by Nagesh Kumar B V/HSSBLR on 06/01/2001 09:46 AM ---------------------------

"Paul, Manoj" mpaul@TRILLIUM.COM on 05/31/2001 06:35:31 PM

Please respond to "Paul, Manoj" mpaul@TRILLIUM.COM

To: ITU-SG16@mailbag.cps.INTEL.COM cc: (bcc: Nagesh Kumar B V/HSSBLR)

Subject:

Hi All,

I have a question on the use of H.235 Annex D (Baseline Security Profile). According to this profile, except for GRQ/GCF messages, all other RAS messages shall contain a hash value computed using HMAC-SHA1-96 algorightm on the entire RAS message. Consider an endpoint sending RRQ to the Gk. In the clearToken field of RRQ message, the endpoint shall fill generalId as gkId (which it got in GCF) and senderId as it's own epId. EpId is generally returned to the endpoint by the gatekeeper in RCF. That means that an endpoint may not have an epId while sending RRQ to Gk. In such a case, how it is supposed to fill the senderId and compute the hash value on complete RRQ message? Any pointers are appreciated.

thanks Manoj Paul.

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