Correct me if am wrong! So what you are looking to do is to add a session
level attribute i.e a=somevalue before any of the media parameter (m) lines
but instead it is getting added after some (m) parameter and hence it is
effect your custom "a" attribute in effect is becoming a media level
attribute??
On Thu, Jan 10, 2013 at 7:40 PM, McLeod, Tim <Tim.McLeod at cassidian.com>wrote:
> Furthering our project for experimenting with various methods of
> providing secure VoIP communications we have a need to provide custom
> negotiation mechanisms. My engineer is currently looking into how this
> might be incorporated into the existing pjsua functionality. He is
> encountering difficulties.
>
>
>
> He is attempting to insert MIKEY session attributes into SDP message, i.e.
> a=key-mgmt: mikey {base64 encoded mikey message} by using the function
> ?transport_encode_sdp? in the transport adapter to add the desired mikey
> message. When capturing the SIP invite message in Wireshark, the coding is
> translated as a media attribute, the suspicion being that this is the case
> because it is added to the message after the media description. Is there a
> clean way to add a session description before the media attribute?
>
>
>
> Your help would (once again) be very much appreciated.
>
>
>
> Tim McLeod MBCS CITP
>
> Principal Engineer
>
> Tel: +44 1633 715097
>
> Mob: +44 7765 088364
>
> Email: tim.mcleod at cassidian.com
>
> RLI: tim.mcleod at eads.r.mil.uk
>
> Website: www.cassidian.com
>
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