graphing multiple OID sources as a sum

[saulbejarano]

Basically I am trying to graph multiple .1.3.6.1.4.1.9.10.19.1.1.4.0 (Active calls on cisco gateways) in one single graph, I need to make the main graph to show as the sum of all this devices and if possible in diferent color.
Does anyone has some information about a template that may do something like this?

Regards,

Saul