[Linphone-developers] Using oRTP to send supplemental data besides the audio

[Steve Strobel]

I am using oRTP to send G.711u audio between some embedded devices 
that use Blackfin processors;  that is working very well.  There is a 
small amount of other data (status information only loosely related 
to the audio) that I also need to pass between those embedded 
devices.  I can think of at least three options for doing that 
(listed from least-to-most preferable):

- Open another socket directly from the application code and use it 
to send the status information.  I would then have to manually deal 
with STUN and other firewall/NAT issues that oRTP already takes care of.

- Create a separate RTP session for the data, sending it like audio 
data, but with a different payload type.  The data isn't a continuous 
stream, so this seems like a kludge.

- Send the data using the same RTP session as the audio.  This seems 
to me like the cleanest method, but I am not sure of the best way to 
accomplish it.

Reading through the API documentation at 
<http://savannah.inetbridge.net/linphone/ortp/docs/> three 
possibilities jumped out at me:  telephone events (such as those used 
to send DTMF digits), FMTP, and RTCP.  Is one of those well suited 
for my task, or am I completely on the wrong track?  Thanks for any 
suggestions.


Steve



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Steve Strobel
Link Communications, Inc.
1035 Cerise Rd
Billings, MT 59101-7378
(406) 245-5002 ext 102
(406) 245-4889 (fax)
WWW: http://www.link-comm.com
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