[cisco-voip] QS: TFTP Server and Phone Loads

[Syed Khalid Ali]

Hi,
 
I have 7911G IP Phones. We have up to 4 to 5 phones at each site. I have tested it via ping command from call manager to ip phones. The delay with 32 bytes packet is around 650 to 675 ms. For 200 to 300 bytes packet the delay goes around 800+ms delay. The link capacity is 256k/256k. I did not measure the packet loss throughly, however, I did check show ip interface output and did not find any packet loss or CRC errors.

I have waited for around 1 hour just to register one phone. Hell only one of the phone was able to register with CallManager. Also what about Peer Firmware Sharing with 7911 series?

Also for 3-4 phones, it will be very difficult to justify the cost for CME at remote site to administration.

One more thing, the problem of ONE-WAY Audio is also there!

Waiting for your response.

Regards,
Khalid

From: rratliff at cisco.com
Subject: Re: [cisco-voip] QS: TFTP Server and Phone Loads
Date: Fri, 12 Sep 2008 10:21:05 -0400
To: khalid_khursheed at hotmail.com

For phone loads it depends on he phone model and version.  The 7940/60 loads are pretty small, the 3rd-gen phone loads can get pretty big.  Over a high latency link you will see some very long times to upgrade 3rd gen phones as TFTP only transmits a small amount of data (512 bytes IIRC) and each packet has to be acked before the next is sent.
For registration the VSAT won't be too bad.  Delay itself won't even make voice quality too bad as long as the jitter is low.  Somebody who has actually used it may have more specific information though.
 -Ryan  
On Sep 12, 2008, at 2:29 AM, Syed Khalid Ali wrote: All,

How TFTP server provides phone load to ip phones. I mean what is the minimum number of BYTES tftp server sends to IP Phones. 

Another things is that we have some branches in location VSAT is the only possible solution. Will ip phones be able to register with call manager.

Using CCM 4.2(3).

Regards,
Khalid

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