In Cisco Routers and Asterisk-based VoIP
(Thu 19 of Feb, 2009 (20:22 UTC))Louis Hansell
This has generated two questions: is it necessary to add routers to a network because you are coverting to VoIP? And, are there inherent issues with Cisco routers and SIP-based telephony?
Whether you need to add routers when adding VOIP depends on the network in question. Many enterprises add VOIP without adding any additional routers. I don't know of any problem using Cisco Routers with SIP or VOIP. Most VOIP companies use Cisco routers no matter what kind of VOIP equipment they have.