7937 Conference Phone

Answered Question
Apr 22nd, 2008

CallManager Active Version: 5.1.3.2000-3

Inactive Version: 5.0.4.4000-1

Administration Version: 2.0.0.1-1

Just received new 7937 with no worthwile instructions in the box. Only a End User License, compliance, warranty, and a single page document written in what appears to be chinese.

Went on line and located the readme file for Firmware version 1.2.1. According to the documents cmterm-7937-sccp.1-2-1.cop.sgn will work with my version of Call Manager.

I followed all the instructions for downloading and installing the software on the call manager. According to the install process the file was successfully installed. I stopped and restarted the TFTP services and the phone does not show up in the list of available devices to add.

How do I get this paperweight to actually work?

Correct Answer by Rob Huffman about 8 years 10 months ago

Hi Lee,

You won't love this given what you have already had to go through, but I thought you should see it anyways. Unfortunatly the 3550 - 24 PWR only supports Cisco prestandard PoE and the 7937G requires IEEE 802.3af PoE . Here are a few reference docs with this note;

Cisco PoE Product Snapshot

http://www.cisco.com/en/US/netsol/ns340/ns394/ns147/ns412/netbr09186a00801f4329.html

Catalyst 3550-24PWR

24 10/100 Cisco prestandard PoE ports and 2 GBIC-based Gigabit Ethernet slots

http://www.cisco.com/en/US/docs/switches/lan/catalyst2950/software/release/12.1_19_ea1c/release/notes/OL543002.html

Power Requirements

The Cisco Unified IP Conference Station 7937G is interoperable IEEE 802.3af PoE (Class 3 device); 48 VDC is required; it can be supplied locally at the desktop using an optional AC-to-DC power supply (part number CP-PWR-CUBE-3=). Use of the power supply also requires the Cisco Unified IP Conference Station 7937G Power Splitter and one of the corresponding AC country cords

http://www.cisco.com/en/US/prod/collateral/voicesw/ps6788/phones/ps379/ps8759/product_data_sheet0900aecd806e021a.html

Power over Ethernet (PoE) Power Requirements FAQ - This shows other Class 3 IP Phones that won't work on a 3550 (the 7937 is too new for this doc, but you see where this is going)

http://www.cisco.com/en/US/products/hw/phones/ps379/products_qanda_item09186a00808996f3.shtml

Hope this helps! (I know its a bummer :(

Rob

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k6lw Tue, 04/22/2008 - 08:40

Not sure what loading this device pack will accomplish as I already installed Firmware version SCCP 1.2(1) and the version in the device pack is 1.0(1). Even stopping and restrating the TFTP service, the phone is not listed as an available device. I'll let you know the outcome.

Adding a Cisco Phone to a Cisco "phone system" shouldn't be this hard.

k6lw Tue, 04/22/2008 - 10:01

Okay i downloaded and installed the device pack and reinstalled the 1.2(1) firmware. The 7937 shows up in the available devices but I still can't get it to work.

Plugging the phone into a 3550 POE switch, the 7937 LCD panel lights up along with the three green LEDs, stays on for about 5 seconds turns off for a second, turns back on for a second and then turns off for about 8 seconds and then repeats. None of the keys appear to do anything.

Pressing **#** does nothing. I think this phone while it looks cool is defective...

CISCO please note. How about including some instructions with the phone???

Correct Answer
Rob Huffman Tue, 04/22/2008 - 10:18

Hi Lee,

You won't love this given what you have already had to go through, but I thought you should see it anyways. Unfortunatly the 3550 - 24 PWR only supports Cisco prestandard PoE and the 7937G requires IEEE 802.3af PoE . Here are a few reference docs with this note;

Cisco PoE Product Snapshot

http://www.cisco.com/en/US/netsol/ns340/ns394/ns147/ns412/netbr09186a00801f4329.html

Catalyst 3550-24PWR

24 10/100 Cisco prestandard PoE ports and 2 GBIC-based Gigabit Ethernet slots

http://www.cisco.com/en/US/docs/switches/lan/catalyst2950/software/release/12.1_19_ea1c/release/notes/OL543002.html

Power Requirements

The Cisco Unified IP Conference Station 7937G is interoperable IEEE 802.3af PoE (Class 3 device); 48 VDC is required; it can be supplied locally at the desktop using an optional AC-to-DC power supply (part number CP-PWR-CUBE-3=). Use of the power supply also requires the Cisco Unified IP Conference Station 7937G Power Splitter and one of the corresponding AC country cords

http://www.cisco.com/en/US/prod/collateral/voicesw/ps6788/phones/ps379/ps8759/product_data_sheet0900aecd806e021a.html

Power over Ethernet (PoE) Power Requirements FAQ - This shows other Class 3 IP Phones that won't work on a 3550 (the 7937 is too new for this doc, but you see where this is going)

http://www.cisco.com/en/US/products/hw/phones/ps379/products_qanda_item09186a00808996f3.shtml

Hope this helps! (I know its a bummer :(

Rob

k6lw Tue, 04/22/2008 - 10:40

Thanks Rob. We located a 2960 PoE switch and saw that the Cisco logo comes up on the phone. So instead of having an elegant one-cable solution I'm back to the mess of a separate power cube to light the phone. What a racket. Neat way to get folks to buy additional hardware as the older phones are "obsoleted". Lee

k6lw Tue, 04/22/2008 - 14:02

Sorry for the Typo. That should be a 3560 PoE switch and not a 2960.... Oh well I ordered the splitter device and will have to wait before I can check this unit out...

k6lw Tue, 04/22/2008 - 17:17

The majority of our closet switches are 3550s thus the Conference phone won't work. We have a very few 3560s and this allowed me to verify the phone works.

Lee

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