On 21 Feb 2017, at 00:50, Harald Welte laforge@gnumonks.org wrote:
Hi Keith,
Hi!
we have had hand-over between BTSs working back in 2009, it is for sure not a new feature at all. This was working long before Abis/IP was implemented, and yes, it is also working with Abis/IP. I don't know why Rhizomatica has it disabled. Maybe you were seeing a particular bug or incompatibility at the time?
I don't remember the details but we had several issues with it:
* Crashing or no audio (e.g. only used at XC3) * Delay increases by number of handovers
Since then we probably fixed the crash, I had removed the timestamp adjustment code. I still need to study the 3gpp AoIP specification but these days I wonder what should be done with the audio stream of the new BTS and I think we should generate a new SSRC, seq and timestamp.
This should trigger the start of a new probation period as of Annex A. But it is a theoretical question (or for E1->RTP systems) right now.
holger