topic calls drop out when using a 7925G phone in Wireless

calls drop out when using a 7925G phone

Richard Bradfield — Mon, 05 Jul 2021 09:05:56 GMT

We have one of our production plants running a WLC4402 7.0.250 with scanners, laptops,iPads ,Ascom i75 phones and Cisco 7925g phones.

There are no problems with the data connections , or the Ascom phones, but the 7925G phones drop out on voice calls continually. Note this site runs 2.4Ghz only

It is not a signal strength problem as will drop out even when it is -57dbm. I have the following questions.

Is the performance of the 7925g affected by the fact it only has one antenna?
Is there an optimum setting on WLC that can give good performance for both Ascom and Cisco?
Should the Ascom and Cisco be on different SSIDs?
We are about to upgrade to a WLC5508 will that make any difference.?
anybody else seen these sort of issues?

We are about to upgrade to a

Rasika Nayanajith — Tue, 09 Dec 2014 05:08:39 GMT

We are about to upgrade to a WLC5508 will that make any difference.?

I do not think WLC upgrade make a difference. Better to think about moving to 5GHz at least for 7925G phones, if you have dual band AP ? What AP model do you have currently ?

Pls attach the "show wlan <wlan_id>" output to see how you configure the current voice SSID.

HTH

Rasika

*** Pls rate all useful responses ****

We have qty 49 1242 APs

Richard Bradfield — Wed, 10 Dec 2014 09:25:12 GMT

We have qty 49 1242 APs running 2.4 Ghz only

here is sh wlan

LAN Identifier.................................. 3
Profile Name..................................... simnet phones
Network Name (SSID).............................. simnet phones
Status........................................... Enabled
MAC Filtering.................................... Disabled
Broadcast SSID................................... Disabled
AAA Policy Override.............................. Disabled
Network Admission Control

Radius-NAC State............................... Disabled
SNMP-NAC State................................. Disabled
Quarantine VLAN................................ 0
Maximum number of Associated Clients............. 0
Number of Active Clients......................... 11
Exclusionlist.................................... Disabled
Session Timeout.................................. Infinity
CHD per WLAN..................................... Disabled
Webauth DHCP exclusion........................... Disabled
Interface........................................ voice
Multicast Interface.............................. Not Configured

--More-- or (q)uit
WLAN ACL......................................... unconfigured
DHCP Server...................................... Default
DHCP Address Assignment Required................. Disabled
Static IP client tunneling....................... Disabled
Quality of Service............................... Platinum (voice)
Scan Defer Priority.............................. 5,6
Scan Defer Time.................................. 100 milliseconds
WMM.............................................. Required
WMM UAPSD Compliant Client Support............... Disabled
Media Stream Multicast-direct.................... Disabled
CCX - AironetIe Support.......................... Enabled
CCX - Gratuitous ProbeResponse (GPR)............. Disabled
CCX - Diagnostics Channel Capability............. Disabled
Dot11-Phone Mode (7920).......................... Disabled
Wired Protocol................................... 802.1P (Tag=5)
IPv6 Support..................................... Disabled
Peer-to-Peer Blocking Action..................... Disabled
Radio Policy..................................... 802.11g only
DTIM period for 802.11a radio.................... 5
DTIM period for 802.11b radio.................... 5
Radius Servers
Authentication................................ Disabled
Accounting.................................... Disabled

--More-- or (q)uit
Dynamic Interface............................. Disabled
Local EAP Authentication......................... Disabled
Security

   802.11 Authentication:........................ Open System
   Static WEP Keys............................... Disabled
   802.1X........................................ Disabled
   Wi-Fi Protected Access (WPA/WPA2)............. Enabled
      WPA (SSN IE)............................... Disabled
      WPA2 (RSN IE).............................. Enabled
         TKIP Cipher............................. Disabled
         AES Cipher.............................. Enabled
                                                               Auth Key Management
         802.1x.................................. Disabled
         PSK..................................... Enabled
         CCKM.................................... Disabled
         FT(802.11r)............................. Disabled
         FT-PSK(802.11r)......................... Disabled
FT Reassociation Timeout......................... 20
FT Over-The-Air mode............................. Enabled
FT Over-The-Ds mode.............................. Enabled
CCKM tsf Tolerance............................... 1000
   CKIP ......................................... Disabled

--More-- or (q)uit
   IP Security................................... Disabled
   IP Security Passthru.......................... Disabled
   Web Based Authentication...................... Disabled
   Web-Passthrough............................... Disabled
   Conditional Web Redirect...................... Disabled
   Splash-Page Web Redirect...................... Disabled
   Auto Anchor................................... Disabled
   H-REAP Local Switching........................ Disabled
   H-REAP Local Authentication................... Disabled
   H-REAP Learn IP Address....................... Enabled
   Client MFP.................................... Disabled
   Tkip MIC Countermeasure Hold-down Timer....... 60
Call Snooping.................................... Disabled
Roamed Call Re-Anchor Policy..................... Disabled
SIP CAC Fail Send-486-Busy Policy................ Enabled
SIP CAC Fail Send Dis-Association Policy......... Disabled
Band Select...................................... Disabled
Load Balancing................................... Disabled

Mobility Anchor List
WLAN ID IP Address Status
------- --------------- ------

Hi

Rasika Nayanajith — Wed, 10 Dec 2014 18:37:14 GMT

Here are some of my suggestions.

Wired Protocol................................... 802.1P (Tag=5)

This should be configured as 6.

DTIM period for 802.11a radio.................... 5
DTIM period for 802.11b radio.................... 5

Cisco recommend value is 2 for this.

FT Over-The-Air mode............................. Enabled
FT Over-The-Ds mode.............................. Enabled

Disable these settings

Provide "show 802.11b" output to see what data rates configured on that band.

If you have 1242 with dual band antenna with sufficient overlapping coverage among cells, then you can create a SSID on 5GHz & put these 7925G for a test.

HTH

Rasika

**** Pls rate all useful responses ****

Ok,the DTIM period set to 5

Richard Bradfield — Wed, 10 Dec 2014 22:17:00 GMT

Ok,

the DTIM period set to 5 as that is what is recommended for the Ascom phones, and we have more Ascom than Cisco phones. I need a compromise! Please find enclosed recommended settings for the Ascom phones

re Fast Transition , I don't see that option appearing on the WLAN security GUI page for the 4402 running 7.0 whereas I do on my 5508s running 7.6 So is it on by default on the 4400 WLC?

Without compromise Ascom

Rasika Nayanajith — Thu, 11 Dec 2014 01:11:57 GMT

Without compromise Ascom setup, it is prefered if you create a new SSID for Cisco phone to test this out.

Here is the 7925G design guides that you can follow when creating this new SSID

http://www.cisco.com/c/dam/en/us/td/docs/voice_ip_comm/cuipph/7925g/7_0/english/deployment/guide/7925dply.pdf

HTH

Rasika

**** Pls rate all useful responses ****

What is the firmware of the

Leo Laohoo — Tue, 06 Jan 2015 20:47:46 GMT

What is the firmware of the 7925G? It should be running a minimum of 1.4(3) or newer.