Hi Tim,
I guess probably you are using below part of *transport_encode_sdp()
*function * *to add your custom attribute to sdp.
if (1)
{
/* Say we add a proprietary attribute here.. */
pjmedia_sdp_attr *my_attr;
my_attr = PJ_POOL_ALLOC_T(sdp_pool, pjmedia_sdp_attr);
pj_strdup2(sdp_pool, &my_attr->name, "X-adapter");
pj_strdup2(sdp_pool, &my_attr->value, "some value");
pjmedia_sdp_attr_add(&local_sdp->media[media_index]->attr_count,
local_sdp->media[media_index]->attr, my_attr);
}
I think you are probably substituting in the above block 'X-adapter' with
your custom attribute. The problem is that pjmedia_sdp_attr_add function
highlighted above is adding that parameter as a media parameter and hence
it will come as a media parameter.
You can instead substitute the above line with
pjmedia_sdp_attr_add(&local_sdp->attr_count,local_sdp->attr,my_attr); and
try again. Hopefully this should solve your problem!
Regards,
Sandeep
On Fri, Jan 11, 2013 at 10:20 AM, Sandeep Karanth <sandeepk.kdp at gmail.com>wrote:
> 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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