Correlation_id overwrite

[kosza]

Hi,

I have problem with correlation between cid and rtcp. When sip server change the cid in the leg B and the rtp goes direct between the endpoints then the rtcp from B will belong to cid of leg A, the rtcp from A will belong to cid of leg B. This is because the rtcpip and rtcpport is the key in the cidCache: the cid will be overwritten with cid of last sdp with same rtcpip and rtcpport (independent from srcip of message). The next flow shows sipgnaling and rtcp, pay attention to the colors.

I think it would be a working solution that there would be a blacklist of srcip's, which can't overwrite existing entry in cidCache. In case of direct media usage the rtcp's belong to leg A, not shared.

[lmangani]

Sounds like the Agents should take this task, and/or you could write a custom mapping script to handle this type of scenario.

[kosza]

It sounds good. Where can I run the script? (heplify-server, homer)

[lmangani]

It's up to you. You might be able to adapt something using the following generics:

• https://github.com/sipcapture/homer/wiki/HOMER-LUA-Scripting
• https://github.com/sipcapture/homer/wiki/Custom-Header-Searching-and-Correlation