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swvaroot
Beginner

Daisy Chaining IP Phones??

Can 7900 series Cisco IP Phones be 'daisy chained'? i.e. Can an IP phone be connected into the PC 10/100 port on the back of another IP Phone? I know an AC power adaptor would be needed for all phones after the one directly on the power inline switch, but would the phone work? Could it register? Is there QoS issues? Would this create errors/alarms on the Switch? I have never seen this mentioned in documentation. Is there any? Does Cisco have a best practice position?

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mikedoherty
Beginner

From http://www.cisco.com/warp/public/cc/pd/si/casi/ca3500xl/prodlit/cfig3_an.htm

" Scenario 2: Configuration of switch connected to daisy chain of IP phones

This scenario may be more common in a call center environment (Figure 3 below). Cisco IP phones are connected in a daisy chain fashion without any PC attached at the far end. The Catalyst 3500 XL switches should be configured such that the first IP phone treats all other Cisco IP Phones connected to itself as trusted devices. Thus, any voice call from any of the IP phones in the daisy chain will get the same high priority as the first IP phone.

Note: All voice and data traffic on the port in this configuration will have the same priority. Hence, we strongly recommend users not to connect any workstations at the far end of the Cisco IP phone daisy chain since both the voice and data traffic in this scenario will get the same high priority and may adversely affect the quality of voice calls."

Hope that helps.

Mike

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