how to configure inbound bandwidth management for voip

Is it possible to configure a Sonicwall TZ or NSA , or Cisco IOS router to reserve inbound bandwidth for UDP traffic  so that VOIP inbound RTP traffic can be protected?  This traffic can be identified by its source network.
LMartinFAsked:
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gheistCommented:
All of mentioned firewall devices can pass VoIP at lowest latency possible up to some meaningful limit.
We do use CBWFQ on Cisco devices along the path (they have documentation, couple of examples deal with RTP/H232)
No SonicWall here, but it must have any sort of QoS
Word of warning - limiting something reduces link utilisation, so look for "soft" limits like CBWFQ.

What I feel you dont have - QoS signalling with your provider...
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gheistCommented:
How would you deflect incoming UDP so that source limits rate? I have not heard of such protocol available...
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LMartinFAuthor Commented:
That's just it.  There is no protocol for limiting the source, however, the source has a known maximum bandwidth value.

Could a portion of the known maximum subscribed inbound bandwidth be reserved for this known maximum source where only traffic from this source network was allowed to use?  In other words, can a router manage bandwidth capacity for the non-reserved portion such that data traffic beyond this non-reserved capacity is either dropped (UDP) or signaled in TCP as incomplete?
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