Does NACK PLI imply NACK?

[bryand...@gmail.com]

When creating an offer for an endpoint that supports NACK, PLI and FIR, which choice below is correct? 

A:

a=rtcp-fb:100 nack

a=rtcp-fb:100 nack pli

a=rtcp-fb:100 ccm fir

B:

a=rtcp-fb:100 nack pli

a=rtcp-fb:100 ccm fir

When using A, it seems that in the answer SDP, Chrome removes NACK PLI, while Firefox removes NACK.  

https://code.google.com/p/webrtc/issues/detail?id=2252 suggests that Chrome's behavior is incorrect, but is Firefox's removal of generic NACK also incorrect?

[Vikas]

Hi,

I am not sure about FF, but for chrome A. is correct. As per issue 2252, the sdp should contain a=rtcp-fb:100 nack pli which it doesnot currently.

/Vikas