IP Telephony

Unanswered Question
Feb 23rd, 2008
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Hi Friends

Can anyone tell me , when i am using cisco IP phone which connect to PC and Digital phone seperately. my IP phone port to switch will be access port or trunk port,

As per my understanding it trunking mode but in one book it is mention as access or trunking , Please explain me if it access mode , how it will happned.

Please find attachement for more ref.


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dongdongliu Sun, 02/24/2008 - 03:39
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hi Vinod

by default, IP Phone`s interface that connect to upstream SW is working on native vlan mode, all of traffic (include voice from itself and date from PC) are untag. people in order to distinguish between voice and data, so using different vlan to transfer voice and date. here trunk is used. for example:

int f0/1

switchport access vlan 100 (for date)

switchport trunk native vlan 100

switchport voice vlan 200 (for voice)

switchport trunk enc dot1q (to direct IP Phone using trunk)

exclude 4000 6000 serial, they are using DTP to auto create trunk with IP Phone.



vinodbharwani Sun, 02/24/2008 - 05:58
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Hi Dongdongliu

Can you send me good documents link alone with configuration..



Mohamed Sobair Sun, 02/24/2008 - 10:37
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The Port have to be access port in order to carry the IP-Phones voice vlan & the Date Vlan.

I am attaching a document that can help you out.





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