IPCCIS problem SV8500 <--> SV9300

[phadobas]

I have an IP CCIS connection to a branch office that uses SV9300.

It's halfway across the planet. Ping response time to that site is 650ms...

When I call them, their phone rings. When they pick up, they say "Hallo?", but I don't hear that. Establishing that audio connection after pick-up takes maybe a second. So they have to say "Hallo?" another time, and I hear that second "Hallo?"

In other words, whatever they say in the first second or so, after picking the phone, I can't hear. After that, the conversation sounds normal. This goes the other way around too. If they call me, they can't hear whatever I say in the first second after pickup.

I've been playing around with LOC ID and AIVCL assignment to prioritize packets going to that office, I also checked "Low Delay" checkbox in AIVCL command, but I could not make an improvement on this. I actually don't even know what that checkbox can do on speeding up packets....

Any idea from anybody?

 

[PFD45]

I've had these problems when using "link reconnect" or transferring out of an auto attendant across CCIS.

Does this happen with a simple station-to-station CCIS call?

 

[phadobas]

Yes, these are plain station to station calls.

So when you disabled "Link reconnect", did that help/improve/resolve the problem?

 

[PFD45]

NTAC provided this when we reported an issue. I know it's a little different than your issue but I know I've seen it before and I'm just trying to remember how we handled it.

What can cause a one second pause in speech cut through after Link Reconnect on the IPS or SV8300 when using Peer to Peer CCIS?
Command 410 1st Data 113 set to a 01 in both the Main and Remote CCIS Nodes will usually correct the issue.

 

[phadobas]

Interestingly, data 113 is not described in the manual and doesn't show up on PC Pro. I can only modify it in CLI...

 

[phadobas]

Got some help from NTAC. They said I'm doing something that's impossible: IP CCIS over a 600ms latency connection...
We adjusted jitter buffer settings, also some timers with ASYDL, but we only made some barely noticeable improvement.

I guess that's the end of trying to debug this.