Isso é algo que já sabíamos na pratica esta comentado em alguns lugares mas faltava para convencer algumas pessoas um comentário de um grande fabricante de equipamento de Voz.
Segue um documento da AVAYA sobre o tema:
http://downloads.avaya.com/css/P8/documents/100016254
Multipath routing
Many routing protocols, such as OSPF, install multiple routes for a particular destination into a
routing table. Many routers attempt to load-balance across the two paths. There are two
methods for load balancing across multiple paths. The first method is per-packet load
balancing, where each packet is serviced round-robin fashion across the two links. The second
method is per-flow load balancing, where all packets in an identified "flow" (source and
destination addresses and ports) take the same path. IP Telephony does not operate well over
per-packet load-balanced paths. This type of setup often leads to "choppy" quality voice. Avaya
recommends that in situations with multiple active paths, per-flow load balancing is preferable to
per-packet load balancing. On Cisco routers, the command for this is "ip route-cache," applied
per interface.
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