Most effective method will be using "virtual-template". You can ad sam many channels in the bundle using "ppp multilink" under "interface virtual-template x" and under physical interface. So there is no restriction of just one channel is allowed using Virtual-template.
Dialer-group is really old method..i agree..
Now multilink-group is used when you want to multilink or bundle more then one "Leased" line or "dedicated" Line (which is not channelized).
So whenever you want to bundle/multilink more then one b channels of channelized T1/E1 line, use "virtual-template". Also you need to use that when you have some per user bases authorization attributes to be downloaded from AAA to router.
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