I'm planning on implement a solution of VoIP over a 2 parallel WAN links.
Because the bandwidth on both links is less than 512kbps, its important to load balance the traffic between both.
EIGRP its implemented over all the network, so i have the option to use variance to load balance between this links (512kbps and 384kbps)
My second option is tu join both link with MULTILINK.
I want to know which of this options is recomended considering that Data and VoIP will go trought this conection.
Anothe consideration is that i need to implement QoS.
My personal recommendation is to use EIGRP. EIGRP has a feature called Unequal Cost Load Balancing, which basically unequally loads the links between two neighbors based on the link's bandwidth. In the event that one link goes down, EIGRP would immediately redirect all flow over a single link.
Please note that EIGRP is a proprietary routing protocol, so if an ISP is involved between the endpoints, it is unlikely to be supported (look at MLPPP some more) and that with low-bandwidth links, some pretty aggresive QoS settings involving Weighted Random Early Detection (WRED), and Low Latency Queuing (LLQ) will definitely be needed to make the links usable with the lowest amount of jitter as possible.
service-policy out wan512
service-policy out wan384