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IP Phones unable to register properly

Unanswered Question
Jul 30th, 2006
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I'm running CCM 4.1(3), currently having a unique situation.


Just deployed 3 IP phones, a 7941, 7902 and ATA-186.


The 7941 works perfectly fine, however the 7902 and ATA were not, they seems to be not able to register with the CCM.


When I brought the 2 problem unit back to my office at level 2, they worked fine, again when I brought them back to level 5, the problem persisted.


All the IP phones are connecting to a CE500 PoE switch, all ports Voice and access vlan are verified. I've also swapped the ports with the working 7941, but to no avail, the CCM still shows the phone as not registerd and the IP address showing level 2 office vlan


I've removed the IP address lease from the level 2 VLAN DHCP service, but still it does not register.


What could be wrong? how to find out what went wrong. The 7941 is working fine, but not the rest at level 5 vlan

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Tony Huynh Sun, 07/30/2006 - 11:09
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Just a quick thought. Have you tried resetting the 7902 and ATA-86 to factory. Perhaps they are storing the old DHCP bindings somewhere.

jliow Sun, 07/30/2006 - 17:14
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ok, I am pretty new to this system, how do I actually do a factory reset?

Tony Huynh Sun, 07/30/2006 - 19:07
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Here is how to do a factory reset on 7902


http://www.cisco.com/en/US/partner/products/hw/phones/ps379/products_administration_guide_chapter09186a0080473893.html#wp1020434


FACTORY RESET FOR ATA:

Instructions on how to reset ATA 186 to factory default values


There are two codes to reset the Cisco ATA 186 depending on the software

version.


For software version

- earlier than 2.xx, use code 444

- 2.xx and later, use code 322873738 (FACTRESET)


If the ATA 186 does not seem to reset to the factory default settings,

please check to make sure you have turned OFF the use of TFTP server for

provisioning.


If you use a TFTP server for provisioning, follow ALL the steps below to

reset the Cisco ATA 186 to the factory default settings.

If you do NOT use a TFTP server for provisioning, follow steps 2-5 only to

reset the Cisco ATA 186 to the factory default settings.


1. Unplug the ethernet cable.

2. Pick up the telephone handset

3. Press the function button on top of the ATA

4. Enter: 322873738#* or 444#* (Reset box configuration)

5. Hang-up

6. Pick up the telephone handset

7. Press the function button on top of the ATA

8. Enter: 305# (Disables the use of TFTP)

9. When prompted to enter a value, enter 0#

10. When prompted with the option to save, enter 3.

11. Hang-up

12. Reconnect the ethernet cable


** Extra Reference Links **


http://cco.cisco.com/en/US/products/hw/gatecont/ps514/products_administratio

n_guide_chapter09186a00801e0e0c.html#wp1094880

jliow Tue, 08/01/2006 - 08:40
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OK, found what what happened. Basically switching problems. Tried the above but still can't work.


I have a 3750 thats doing routing of a few vlans i have across the building. I have a few 3560s thats directly connected to this switch using the SFP port. During this new implementation, I've linked the CE500 to one of the 3560's SFP port. Thinking it will be able to trunk it all the way back to the 3750 to do the inter vlan routing. Somehow it is not working.


To summarise


3750 - does the vlan routing

3560 - Vlan 300 - for level 3

CE500 - vlan 500 - for level 5


3750 -- connects to 3560 -- both link ports configured as mode trunk and 802.1q encapsulation


CE500 -- connects to -- 3560


CE500 using smartport config as switch role for uplink port

3560 configured as mode trunk and 802.1q encapsulation


somehow the Vlan 500 subnet is not able to be routed to Call manager subnet in vlan 200. Where the IP phone types 7902 and ATA186 do not have the ability to understand trunk, thus explains why 7911 and 7941 works only


If I want to use the uplink on the 3560 to be used for connecting to the CE500 thats in a different vlan, What should I do?



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