Re: H.248 using RFC2833/RFC2198 and SRTP/MIKEY

Hi,

thanky you for your response.

I would like to avoid SDP as it not my favorit protocol.

But I have not find any possibility how to map H.245 TCS to H.248.
Especially receiveRTPAudioTelephonyEventCapability and mediaPacketizationCapability.

I.e. my question does not come from SDP but from H.245 area.

Best regards,
  Tomas


-----Original Message-----
From: Schwarz Albrecht [mailto:[email protected]] 
Sent: Thursday, June 17, 2010 2:02 PM
To: Kukosa, Tomas; [email protected]
Subject: RE: [Megaco] H.248 using RFC2833/RFC2198 and SRTP/MIKEY

to 1):
- RFC2833 is obsoleted by RFC 4733, ...! 
- just use the SDP elements as defined by the RFCs in the H.248 LD/RD
- it looks fairly strange to use H.248 binary encoding when such
SDP-controlled RTP capabilities are used in the IP domain; do you really
want to translate SDP text encoding at your MGC call control interface
in "SDP binary" format at H.248?

to 2):
- see Draft H.248.77 for H.248-controlled SRTP endpoints
- see 3GPP 23.334 and 29.334 as a first H.248 Profile with SRTP support

> negotiate SRTP contexted between the MG and peer media 
> endpoint ?(can be also H.248 MG but also any other kind of 

You refer to the IP media-path (RFC 5479) related keying methods for
SRTP.
Any procedures at the H.248 MG "IP media-path" interface are per se out
of scope of H.248.
If ... then subject of an H.248 profile specification.


> -----Original Message-----
> From: [email protected] 
> [mailto:[email protected]] On Behalf Of Kukosa, Tomas
> Sent: Donnerstag, 17. Juni 2010 10:59
> To: [email protected]
> Subject: [Megaco] H.248 using RFC2833/RFC2198 and SRTP/MIKEY
> 
> Hello,
> 
> I start looking to H.248 protocol and studying what it can do 
> and what can't.
> 
> I am not able to find any documents related to following 
> topics/questions:
> 
> 1) RFC2833/RFC2198
>   - how the MGC can get RFC2833/RFC2198 capabilities from the 
> MG? (used payload types, list of supported tones, ...)
>   - how the MGC can put peer  RFC2833/RFC2198 capabilities to 
> the MG termination?
> 
> 2) SRTP/MIKEY
>  - is there any document how to use MIKEY within H.248 to 
> negotiate SRTP contexted between the MG and peer media 
> endpoint ?(can be also H.248 MG but also any other kind of 
> SRTP endpoint)
> 
> BTW I would prefer to use binary encoding of H.248 and if I 
> understand it well it can not use SDP equivalent properties, 
> is it right?
> 
> Thanks in advance for any hint.
> 
> Best regards,
>   Tomas
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