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

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What number of telephones and listing numbers could be configured on Cisco Unified Communications Supervisor Categorical by default?

Reply: Zero!

Sure, by default, no ephones or listing numbers can register. Earlier than doing the rest, the next configuration is required:


Router#configure terminal


Router(config-telephony)#max-ephones 4

Router(config-telephony)#max-dn 8

This permit as much as 4 telephones to register / be configured and eight listing numbers.

In the event you do not do that, the router won’t permit ephones or ephone-dns to be created. Right here is an instance of what would occur:

R1(config)#ephone 1

ephone tag 1 exceeds max-ephones 0

R1(config)#ephone-dn 1

dn 1 exceeds max-dn 0

The utmost variety of ephones and ephone-dns that may be configured is platform dependent. Right here is an instance of my router that may help 30 telephones with as much as 150 ephone-dns:

R1(config-telephony)#max-ephones ?

Most telephones to help

R1(config-telephony)#max-dn ?

Most listing numbers supported

Cisco have an incredible doc exhibiting you what number of ephones/dns are supported on particular platforms. Take a look here

For instance, utilizing CME model 4.3:

The 2801 helps 25 telephones and 120 ephone-dns

The 2811 helps 35 telephones and 144 ephone-dns

The 2821 helps 50 telephones and 192 ephone-dns

The 3845 helps 250 telephones and 720 ephone-dns

(There are others, please check with the hyperlink above for a full record)

Cisco additionally advocate that you simply solely allow the variety of ephones and ephone-dns for the quantity you require, not the utmost the platform can help. The reason being that when a ephone / ephone-dn is created, it makes use of up reminiscence on the router. Do not simply create them as a result of you may! Create solely what’s required.

To your success!

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