Ping problem with avaya VoIP phones

[royalblues]

whenever i try to ping a avaya voip phone from a cisco device, i do not get a continuous response.

MS_VOICE_MEX_R01#ping 172.31.2.52 repeat 100

Type escape sequence to abort.

Sending 100, 100-byte ICMP Echos to 172.31.2.52, timeout is 2 seconds:

!!.!!.!!.!!.!!.!!.!!.!!.!!.!!.!!.!!.!!.!!.!!.!!.!!.!!.!!.!!.!!.!!.!!.!

!.!!.!!.!!.!!.!!.!!.!!.!!.!!.!

Success rate is 67 percent (67/100), round-trip min/avg/max = 1/1/4 ms

MS_VOICE_MEX_R01#

But when i try to ping the same from a desktop i do get a continuous response.

Can anybody tell me the reason for this

Narayan

[mparekh]

Its funny while back my friend had the same issue, i asked him if he ever found a reason so he sent me this link:

http://www.avayausers.com/showthread.php?threadid=1906

Not sure wether its true or not but thought it was interesting. Maybe a Avaya rep has a better answer.

[royalblues]

Milan,

I don't think this is to prevent the DOS attack cos i am always able to ping the phone from any desktop continuously.

It only shows this absurd behaviour when i try to ping from a network device like a router/switch

Narayan

[ursa.minor · Accepted solution]

Avaya IP Telephones implement an ICMP rate limiter. The Microsoft ping.exe command sends pings 1/second avoiding the rate limit. A Cisco 3825 sends pings at about 1/ms easily tiggering the rate limit.

[royalblues]

Thanks for the info..

Is this documented somewhere though

Narayan

[timd]

It is documented.

http://cisco.com/en/US/tech/tk1077/technologies_tech_note09186a008010edb8.shtml