Cisco Emergency Responder - Adding manual Phones

[mlsc]

Hi All

We are implementing CER in our offices and I had a question concerning adding manual phones. We have a VG350 that supports many analog phones, 10 of these phones we want to manage differently from a 911 perspective. In CER, added the DN manually for each one of these 10 phones, and in the IP subnet section, I also added the subnet of the VG to manage the remaining phones.

It seems CER always takes the subnet first, and then the manual phones second. In other words, I want CER to see the manual phones first (10 of them) and send them to the special 911, and then if not a manual phone, check the IP subnet for the rest of the phones. 

Any thoughts, ideas.

Thanks, Michael

[Adarsh Chauhan]

Hi Michael,

On the first place we should not be overlapping the ERL.

You must manually define a phone if any of these conditions apply:

• Emergency Responder does not support automatic tracking of that type of phone, for example, if the phone is an analog phone connected to an analog line gateway such as analog phones connected to the Analog Telephone Adaptor (ATA) or the Cisco VG200 series Analog Voice Gateway.
• The phone is hosted on an unsupported port, such as a router port, a hub connected to a router, or a port on an unsupported switch.
• No IP subnet is configured for the phone.

There is no configurable parameter for preference.

Please rate if helpful.

Regards,

Adarsh Chauhan

[mlsc]

Hi Adarsh

Thanks for your response.

From what I read, as of CUCM/CER 10.x, the IP subnet from a VG350 can be used to define the ERL, even if it is an analog phone. If I understand your explanation correctly, I have to decide to either manually define all analog phones or use the IP subnet of the VG. I cannot mix methods since there is no precedence setting for the ERL matching.

thanks, michael

[Adarsh Chauhan · Accepted solution]

Hi Michael,

Yes, you are correct. you will have to choose between the two.

Phones that you can manually define or track using IP subnet

Phones that are connected to analog line gateways such as Cisco VG350 or VG224 series or ATA 180 series
Any H.323 endpoints

Please rate if helpful.

Regards,

Adarsh Chauhan

[mlsc]

perfect, thanks for your answer.

[scheived]

CER using subnet info over manual is a huge limitation is there any way around this? I can't understand the logic, if you manually configure a phone it should take precedence. This might even be a deal breaker for CER. I'm wondering if there is a system setting that changes this? I'm thinking a possible solution is to take a /24 address range, configure CER with that range as a /25 then moving the DHCP range to the begining half of the subnet and then using dhcp reserve to assign phones which are to be manually configured to the upper end of the ip range so they won't be tracked by CER. What a pain!