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Problems with IP Phones registration to CUCME on SG200-50P

Problems with IP Phones registration to CUCME on SG200-50P

System setup:
- Router Cisco 2811 with IOS 12.4(24)T5 Advanced IP Services, CUCME 7.1, DHCP Server

   with HWIC-4ESW
- Switches:

   - old - SLM224P

   - new - SG200-50P (SLM2048PT), OS v1.3.2.02

- IP Phones 7911 and 7931, OS v8.4.2

One VLAN (for desktops and IP Phones) and one IP subnet, no voice VLAN.

Network diagram:

C2811---HWIC-4ESW---SWITCH---IPPhones

Problem description:
1. In the old setup with SLM224P everything works fine.

   Connected phones almost immediately (1-2 sec. after power up) get ip address, configuration and registers to CUCME.

2. When switch is changed to new SG200-50G:

   - ip phones get their ip address and tftp configuration very slowly - about 10-20 seconds

   - ip phones cant register to CUCME at all. On the router with SCCP debugging turned on there is no sing of registration attempt

   - after reconnecting the old SLM224P situation backs to normal

Things that have been checked or tried without success:

- ports speed and duplex auto, correct detection - although not tested with manual settings

- CDP/LLDP on/off

- smartport mode auto and most static settings, also with disabled smartport

- power cycle / reset

- spanning tree and port security settings

- solutions from that post - https://supportforums.cisco.com/thread/2232161

None of the above methods worked.

The only action that allowed ip phones to register was changing smartport role to static IPPhone + Desktop.

After that when phone was disconnected and then reconnected the problem exists again - no registration (IP Phone status DECEASED in CUCME). Same with power cycle/reset.

Please advice.

Thanks in advance.

3 REPLIES
Green

Problems with IP Phones registration to CUCME on SG200-50P

Hi Artur, to make sure everything is spelled out. I see some omissions but I imagine they are there.

1 - You have created the voice vlan?

2 - Have you set a phone on an untagged access port for the voice vlan to see if it works?

3 - Have you tried to set the auto voice vlan on the switch so it dynamically assigns the role for ip phone + desktop?

4 - When rebooting the switch, you did ensure to save the start up to running config?

5 - Have you manually set spanning tree PORT FAST for the phone ports?

-Tom
Please mark answered for helpful posts

-Tom Please mark answered for helpful posts http://blogs.cisco.com/smallbusiness/
New Member

Problems with IP Phones registration to CUCME on SG200-50P

1 - You have created the voice vlan?

Nope, flat network, one ip subnet (10 hosts and 10 phones)

2 - Have you set a phone on an untagged access port for the voice vlan to see if it works?

Yep, phones are connected to untagged access ports of the one and only vlan

3 - Have you tried to set the auto voice vlan on the switch so it dynamically assigns the role for ip phone + desktop?

Not sure about auto voice vlan setting, although there was no triggers to AVV - no static voice vlan, no CDP/VSDP advertisements of voice vlan.

We've tested static and auto smartport roles (independently of auto voice vlan feature) with successful auto-detection.

The switch was pretty much in default out-of-the-box config (beside management parameters).

4 - When rebooting the switch, you did ensure to save the start up to running config?

Yes, running to startup

5 - Have you manually set spanning tree PORT FAST for the phone ports?

No, we haven't tested that. But portfast should be set automatically for the desktop and ip phone smartport roles.

Green

Problems with IP Phones registration to CUCME on SG200-50P

Hi Artur, the macro for IP phone + desktop is defining the port for voice vlan tagged, data vlan untagged. Sometimes the spanning-tree portfast doesn't trigger depending on the phone and in some cases causes phones to go in to a reboot loop or simple not intiailize.

But essentially what you're telling me is the switch has no configuration for voice. There may also be a negotiation issue between the switch and the HWIC.

But with that aside, if your symptom is the same as that post in your initial posting, try to downgrade the firmware to 1.0.0.19

http://software.cisco.com/download/release.html?mdfid=283771822&catid=268438038&softwareid=282463182&release=1.3.5.58&relind=AVAILABLE&rellifecycle=&reltype=latest

This firmware did not support a lot of features. So you can try to dumb down the switch manually or basically back-rev firmware to the point the switch loses features. I would ultimately think the phone has a problem since it seems other  phones (Cisco 3905 CSCub09465) have the same bug report with LLDP.

-Tom
Please mark answered for helpful posts

-Tom Please mark answered for helpful posts http://blogs.cisco.com/smallbusiness/
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