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we are in the planning stages of a VoIP deployment based on AVAYA’s Definity 1 PBX.
in order to send voice traffic over our existing data network traffic from our PBX will be sent through the lan and onto an ATM network. my question is simple on the LAN do I need layer 3 switches at all points between the PBX and the router to ensure QoS or can I use my existing layer 2 switches and use vlans (802.1q) to provide good quality voice calls?
You can use VLANs for sure to prioritise traffic at layer 2 via 802.1q, check out the cisco website for plenty of info on voice QoS at layer 2 or 3.
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