Dear Mr. Okubo, With regards to the ETSI Tispan work there are a couple of items relevant to the NAT/Firewall traversal. They are: ETSI TS 102 233 "Gate Control Protocol" ETSI ES 283 018 "RACS: H.248 Profile for the Ia Interface" The Ia Interface Profile makes reference to H.248.37. Regards, Christian OKUBO Sakae wrote:

Dear Q.5/16 experts,

At the last Rapporteur meeting in Geneva (28 November - 2 December 2005), I undertook to survey the subject studies in other SGs. Here is some information as I have collected from the NGN-GSI event last month and Study Group documents at the ITU-T site <http://www.itu.int/ITU-T/meetingdocs/index.asp>:

1/ SG13

NGN RACF (Resource and Admission Control Functions) in the transport stratum contains such functions as "NAPT control", "Firewall working mode selection". A current draft of Recommendation Y.RACF is found as TD-WP4-81R2 of SG13 at the 16-27 January 2006 directory.

It contains definitions of NAP, NAT, NAPT control, NAT traversal in Section 3. Section 6.2 is titled "NAPT Control and NAT Traversal Mechanisms and Scenarios." Section 9.2 is titled "Procedures for NAPT Control and NAT Traversal."

This work is under Question 4/13 (Requirements and framework for QoS for NGN).

2/ SG11

My understanding is that Q.5/11 (Resource control and signalling requirements and protocols) deals with the protocols related to RACF. Currently the following draft Recommendation is available as TD-GEN/11-248 at the 23-27 January 2006 directory of SG11:

Draft Q.rcp3 − Resource control protocol − Protocol at the Rn/Rw (ex-Re) interface

This should address the NAT/firewall traversal, but I cannot find relevant descriptions there. Presumably it would be in "to be worked out" status. Other protocols under development are listed in TD-PLEN/11-74 of SG11.

3/ ETSI-TISPAN

ETSI-TISPN is recommending to reuse its protocols in NGN in its liaison to SG11 and SG13 (TD-GEN/11-241), and they would be containing the NAT/firewall traversal, I heard. But I cannot spot a particular TISPAN specification in that liaison. It was also mentioned that it would be H.248 and NSIS related (sorry just key words I caught). We got approval of H.248.37 (Gateway control protocol: IP NAPT traversal package) from the previous SG16 meeting in July - August 2005. Probably Q.3/16 expert (Mr. Schwarz?) could help me to clarify the situation.

4/ SG9

It has Recommendation J.192 "A Residential Gateway to support the delivery of cable data services" apparently addressing generic firewall management solution, managed network address translation among other things.