March 28, 2023

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

2 min read

How quite a few telephones and directory numbers can be configured on Cisco Unified Communications Supervisor Convey by default?

Remedy: Zero!

Of course, by default, no ephones or directory quantities can register. Ahead of carrying out nearly anything else, the next configuration is expected:


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

This permit up to 4 telephones to sign-up / be configured and 8 directory numbers.

If you don’t do this, the router will not let ephones or ephone-dns to be established. Listed here is an example of what would take place:

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

The maximum quantity of ephones and ephone-dns that can be configured is platform dependent. Below is an instance of my router that can aid 30 phones with up to 150 ephone-dns:

R1(config-telephony)#max-ephones ?

Most phones to help

R1(config-telephony)#max-dn ?

Optimum listing quantities supported

Cisco have a terrific document displaying you how a lot of ephones/dns are supported on specific platforms. Have a glimpse here

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

(There are many others, please refer to the link over for a comprehensive record)

Cisco also endorse that you only enable the amount of ephones and ephone-dns for the range you involve, not the utmost the system can assistance. The explanation is that when a ephone / ephone-dn is designed, it works by using up memory on the router. Do not just make them simply because you can! Create only what is demanded.

To your success!

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