Cisco CCNA Voice Certification Exam Tutorial – Default Max Ephone and Ephone-dn and Configurations

How lots of telephones and listing figures can be configured on Cisco Unified Communications Manager Specific by default?

Reply: Zero!

Certainly, by default, no ephones or directory numbers can register. In advance of doing anything else, the pursuing configuration is required:


Router#configure terminal
Router(config-telephony)#max-ephones 4
Router(config-telephony)#max-dn 8

This allow up to 4 phones to register / be configured and 8 listing numbers.

If you don’t do this, the router will not allow ephones or ephone-dns to be made. Below is an illustration of what would occur:

R1(config)#ephone 1
ephone tag 1 exceeds max-ephones
R1(config)#ephone-dn 1
dn 1 exceeds max-dn

The optimum range of ephones and ephone-dns that can be configured is system dependent. Here is an illustration of my router that can guidance 30 telephones with up to 150 ephone-dns:

R1(config-telephony)#max-ephones ?

Maximum telephones to assistance

R1(config-telephony)#max-dn ?

Greatest directory figures supported

Cisco have a good doc exhibiting you how a lot of ephones/dns are supported on distinct platforms. Have a glance listed here

As an illustration, utilizing CME model 4.3:
The 2801 supports 25 telephones and 120 ephone-dns
The 2811 supports 35 phones and 144 ephone-dns
The 2821 supports 50 telephones and 192 ephone-dns
The 3845 supports 250 telephones and 720 ephone-dns

(There are other individuals, please refer to the connection over for a entire record)

Cisco also suggest that you only permit the amount of ephones and ephone-dns for the amount you involve, not the most the system can help. The motive is that when a ephone / ephone-dn is created, it employs up memory on the router. You should not just make them for the reason that you can! Make only what is needed.

To your achievements!

Supply by David Bombal