[SIPForum-discussion] Huawei Switch Media issue,

[Olle E. Johansson]

18 sep 2011 kl. 09:03 skrev Kareem eid:

> 
> Is there any way to find out why the Huawei switch  is sending c=IN IP4 0.0.0.0 in 180 ringing?
> 

This used to be a way to indicate call hold, meaning they want to send you a ring tone, but don't receive any media. The reason why we do not recommend this is that this also blocks RTCP. The a=sendonly attribute would propably be a more "modern" way of indicating the same.

/O