11-15-2004 11:05 PM - edited 03-13-2019 07:01 AM
I have a Call Manager 4.01 Sr1a implementation with approximately 55 7940/7960 IP Phones. They are connected with 2 3560 48 port inline power phones, a 3550 24 port and then a 3750 24 Port Gigabit switch. I have a voice and data vlan with all the voice servers and phones in the voice vlan. I recently upgraded to the 6.05 firmware load on the phone and noticed a strange thing. For off-net and on-net calls sometimes, maybe 3 out of 10 calls users will hear a delay in the audio. Once a call is established you try to speak and hear nothing for 3 seconds. After the 3 seconds you can hear the other caller. Some delay in the RTP stream. I've opened a TAC case and they helped me take the firmware back to 6.04 but I am still hearing the same delays. They've wanted me to gather packet traces but since this is so random it is difficult to track down. I essentially have to do a port span and be right at the phone to capture the traces correctly. Wondering if anybody has seen this before?
I've swapped switch ports, ethernet cables, phones. I'm using auto qos voip cisco-phone on the switch ports for the QOS features. There's no inter-vlan routing going on for the voice traffic.
The switches are in a hub-and-spoke design with all the switches hanging off the gigabit switch. They're uplinked with each other via copper gigabit.
12-04-2004 05:25 AM
I'd like to make sure I'm understanding this:
The latest 7.1 phone load on a 4.0 cm has eliminated the audio delay. But it is casuing other problems with 3.3 cm even though it says it works with 3.3 cm.
The special T017 load with 3.3 cm has eliminated the audio delay without causing any other problems.
Have I got that right?
Thanks
Rob
12-04-2004 09:58 AM
Does anyone have expirence with 7.0 phone load and 7914 side cards with CCM 4.0.2 ?
Thanks
Tom
12-06-2004 05:52 AM
You must update the 7914 firmware when you upgrade the 7940/7960 firmware.
12-04-2004 12:22 PM
rvincent:
That is what I am experiencing, yes, you've got it right.
The fact that it says 7.1.1 allegedly works with 3.3 was the first thought that came to mind when I started experiencing problems.
TMH
12-08-2004 09:17 AM
I'm having the same problem with a 3.3.4 customer. Has the P0030600T017 load you got from tac resolved the delay & your freezing?
thanks
Rob
12-08-2004 10:50 AM
Rob,
Sorry about the delay but now I'm having some problems with the TFTP server serving out that darned version of the FW. Attempting to have a specialist come out soon and fix that, so I can try to fix the FW issue. Stay tuned.
T
12-08-2004 10:50 AM
Yes, the P0030600T017 load fixed both the internal echo/delayed audio *and* the freezing; I'm very pleased with it. We've had some other internal echo issues, but that's because of a bandwith "bottleneck" issue we have between two of our locations.
TMH
12-08-2004 11:09 AM
thanks
i've just gotten the load from tac and will be giving it a shot on a few phones as a first step. if that resolves issue, i'll use it for all phones
Rob
12-08-2004 12:14 PM
I loaded the 7.1.1 firmware on Friday. Everything seems to be cleared up and running great. However, I am on CallManager 4.0(2a). I have had no new issues.
12-08-2004 12:28 PM
I also loaded the 7.1.1. fw on a 4.0 call mgr today and am hoping for the same "no issue" result.
12-09-2004 01:54 PM
Rob,
I've loaded the 6.0(T0.17) load onto certain 7940/60 phones and it seems to be working with my 3.3(3)sr4a system. More to come but haven't had ANY problems this morning with 3-5 second delay.
T
12-09-2004 10:30 PM
I have been following this thread with interest. This seems to be pretty widespread, but I am a bit skeptical that it is really a bug. I have 4 clusters all running 3.3.3 SR4A with about 1500 IP phones (6.0.5), and another 500 plus analog ports. This covers 46 sites in 2 states, includes the full gamut of gateways, routers, switches, yet I have only once seen a similar problem with one phone. In that case a Sniffer showed the Call Manager subscriber delaying the audio cutthrough command. I configured the phone to register with a different subscriber, and the problem never came back.
I guess I should just count my blessings, but it doesn't make sense. What am I missing here?
12-10-2004 06:39 AM
You are right. Obviously can't be happening on every site. I have many customers not experiencing any audio delay.
But the last 2 installs are both experiencing it.
The first is 4.0 cm and the problem started right away. The 7.1.1 load was put on a few phones and those are not having any delay. The load will be added systemwide this weekend.
The second site is a 3.3.4 cm. I've put the 6.0(T017) on a few phones and am awaiting feedback.
Rob
12-10-2004 06:57 AM
I have a 3.3(4)sr2 cluster, just one, that has 600+ IP phones on it...I happened to notice the problem one day while calling one of our other locations (three buildings separated by fiber, one CCM in each location, but they are in one cluster because of the high-speed links). We were using the 6.0.5 load. A few weeks later I was at one of our PC help desks and one of the techs mentioned he had just had the same delayed audio problem. I then started asking my "chronic" users if they'd ever had anything happen like that, and they all reported back that they had...but it was completely random. So it was happening, just not being reported because, I suppose, it was so random.
I was also skeptical that it was a bug at first, but the T017 load has eliminated the problem for us.
TMH
12-10-2004 02:56 PM
The problem you guys are running into is probably CSCef07550, which is fixed in P0030600T017.
CSCef07550: Audio resume after hold sometimes takes 5 - 7 seconds
Although the title of the bug indicates the problem was found resuming held calls, the root cause was in the tcp-layer and therefore shouldnt make a difference whether its a resume or new call, conf, etc (as long as the media stream is being setup).
The only way to get P0030600T017 is to open a TAC case.
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