topic Re: Wireless phone roaming problem in Wireless

Wireless phone roaming problem

rich.knight — Sun, 04 Jul 2021 16:35:02 GMT

We are having problems with our 7920 phones as well as Spectralink phones roaming. We have no problems with our data terminals roaming. The phones and terminals are on separate Vlans on the same aps. The aps are running 12.03t. RSSI is above 20. Separate channels 1,6,11. The phone will totally drop off the network when it tries to roam.

Re: Wireless phone roaming problem

tcggg0 — Tue, 27 Apr 2004 19:43:35 GMT

Try switching to IOS. It seems to clear up some of the issues we had with Spectralink phones.

Re: Wireless phone roaming problem

michaelgillespie — Wed, 30 Jun 2004 18:17:32 GMT

There were some issues w/ radio cutting in and out w/ 12.03T. It is recommended to use 12.2(15)ja, which would require a migration to IOS. Also want to ensure that the 7920 has the latest code (01.07) from CCO, where scanning and roaming has been improved. Also need to ensure there is adequate RF overlap of non-overlapping channels for seamless roaming. Refer to http://www.cisco.com/en/US/products/hw/phones/ps379/products_white_paper0900aecd800f6d97.shtml for more info.

Re: Wireless phone roaming problem

psion — Wed, 09 Nov 2005 22:00:01 GMT

I do not know if you checked this yet but at the recent Cisco Networkers Convention in Toronto I have learned that there should be 20% cell overlap for VOIP as opposed to the usual 10% overlap for a regular data network.

Re: Wireless phone roaming problem

michaelgillespie — Thu, 10 Nov 2005 07:43:16 GMT

2.0 is the latest on CCO and that should be used. Requires IOS code on the AP (current = 12.3(7)JA). Should optimize for 11mbps.

Re: Wireless phone roaming problem

p.holley — Fri, 23 Dec 2005 16:02:04 GMT

How do you check on the AP how much % cell overlap you have between channels?

Re: Wireless phone roaming problem

p.holley — Wed, 28 Dec 2005 21:45:15 GMT

Hey Rich,

How did you solve your issue with roaming? I am experiencing the same drop off the network, when the 7920 tries to roam. Thanks

Re: Wireless phone roaming problem

rich.knight — Tue, 03 Jan 2006 16:02:01 GMT

We had to upgrade the firmware on the phones. We switched to 2.0 and it seemed to fix the problem.

Re: Wireless phone roaming problem

etmarcof — Wed, 11 Jan 2006 17:44:59 GMT

Hi rich!

I have the same problem, i have CCM 4.1.3sr2 and 7920 firmware 2.1.

What versions do you have of:

CCM

7920 firmware

AP model and IOS Version?

Do you have your aps fixed to 11MB?

Could you also send a configuration of your ap?

Best Regards,

Re: Wireless phone roaming problem

rich.knight — Wed, 11 Jan 2006 22:42:32 GMT

The problem started when we upgraded our AP's from 350's to 1231's. The way that I understood it was that when running multiple SSIDs on a 1231 AP it assigns a MAC to each SSID. On the 350's it just sent out all 0's. With the older versions of firmware on the 7920's (pre 2.0) they would try to roam and would be looking for 0's for the next AP. With the 1231's sending out a specific MAC they wouldn't see a next hop so they would stay associated to where they started until they totally lost coverage.

At least that is what I got out of the explanation I was given.