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[Linphone-developers] Is it possible to set ToS of outgoing packets with

From: Nitendra Tripathi
Subject: [Linphone-developers] Is it possible to set ToS of outgoing packets with linphone softphone.
Date: Wed, 11 Apr 2012 12:59:23 +0530 (IST)

Dear linphone-developers,

we are trying to set the ToS(type of service ) on the outgoing IP packets from linphone but not able to succeeded yet.
we have posted the issue in linphone-users list but not got any response from there ....

please find below the issue  we have posted on linphone users mailing list.
we are using linphone(3.5.2) for video calling with asterisk in ubuntu.
most of the things work well,   except the setting the ToS (type of service) to the 
ip packets originating from the  linphone.

Our asterisk server is configured to set the appropriate tos to the ip packets and those 
tos are visible in the traffic from sip server to linphone through the tcpdump tool,  
but the packets which are going from linphone to the sip server(asterisk) have  the 
default tos (i.e. 0x0) only. however some initial signaling packets from linphone that have 
tos with them but the subsequent data packets have only default tos with them.  

we want to set the tos to the packets so that these audio/video packets can be prioritized
in network traffic in MPLS. We intent to set the MPLS CoS based on the ToS in IP header.

We would also like to mention that when the softphone (linphone) is replaced with a 
hardphone (grandstream) the packets do bear the ToS in the same configuration.

Any help is greatly appreciated. 

Nitendra Tripathi
Software Development Deptt.
Tel. 011-46710500 (extn. 306)

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