Cisco3660 loosing VoIP frames

[boris556]

We have Cisco3660 (IOS IP, 12.1.1T) with 2 FE ports connected to 2 LAN segments.

There are around 50 Voip (g.729, 20 MSEc sample) calls running between 2 segments through router.

Sometimes calls disconnected because keep alive massage was not arrived.

On 2 LAN analyzers that connected to the segments we can see that router looses keep alive frames?.!

Is somebody faced the same problems?

Is it possible that 3660 router loosing frames with such a low load? Or it's the version bugs.

[jkurth]

If you have a software agreement you should upgrade to the highest level you can get to with your memory restrictions in mind.

How much memory/flash memory?

12.1.1T is ancient IOS.

Jeff

[boris556]

Thanks for the answer.

We did the same test on Cisco 3640 with 12.1.3a-XI4

software, and it also lost frames.

May be it's known problem that routers loosing frames

on relatively high (50 calls) Voip Traffic?

From BW point of view it's very small number - 1,300Mbps

On cisco 3660 we have 32 Mb DRAM