02-24-2024 08:24 AM
Please explain the following command:
Router(config-telephony)#max-ephones 2
Router(config-telephony)#max-dn 2
Router(config-telephony)#ip source-address 192.168.1.1 port 2000
Router(config-telephony)#auto assign 1 to 5
02-24-2024 10:38 AM
1. Option 150 points out the TFTP server(s) the phone gets its configuration from
2. Sets the maximum number of phones that can register to the router
3. Sets the maximum number of directory numbers that can exist in the router
4. There is no direct relation between these two. Often you would configure double the number of max-dn to the max-ephone, but this is no hard truth, it’s just common practice
5. This is the source IP of the CME or SRST service that the router will use
6. Not sure what this is used for. Likely you can Google it
02-24-2024 09:35 PM
02-26-2024 04:02 AM
Please explain the directory number and why it is necessary for phone configuration. Could you explain it through an example? is there any relation between IP phone and directory number? For if I have 10 IP phones then how many #max-dn and #auto assign do I have to configure by command?
02-26-2024 07:35 AM
The way to think of it is that the phone and the directory number are two discrete and separate objects. Then, as part of the phone configuration, you tell the system which directory number should appear on which button.
Max-ephones is the maximum number of phones that can be registered to the system, and that is limited by licensing. Ditto with max-dn, but since a single phone can have more than one directory number on it, it is common that the max-dn setting ends up higher than the max-phone setting.
As for auto-assign, when that is in place the first phone that registers will automatically be assigned the first (lowest ephone-dn number) directory number and that directory number will be placed on button 1 on that phone. The next phone to register will be assigned the second number and so on. Once the number is assigned that information is saved so the same phone will always have that same number until you, the administrator, changes it.
Maren
02-26-2024 10:02 AM
To add what @Maren Mahoney wrote in her excellent answer you don’t need to use auto assignment for director numbers, you can configure that specifically on each ephone configuration element in the router to control which phone number each phone has.
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