When to Call for Help
Calling for help takes time. Remember, the critical response time is just 10 minutes. Every second counts. Unless you have extra rescuers available, you should only call for help after all victims have been recovered.
If there are extra rescuers available and you have a suitable communications device, designate one person to place an emergency call. This person should stay at least 25 m away from the transceiver searchers to prevent electronic interference.
What if there is another group nearby? Accepting help is almost always a good idea but make sure to manage this influx of new people. Sometimes it's not helpful to have too many people on the scene at once. And of course, always make sure all transceivers are in search mode.
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If you have a surplus of rescuers and a functional communications device, send one person to make a call. This person should be at least 25 metres away from the group before making the call in order to prevent electronic interference. 
Be sure to use all of the resources you have available to you on site. If you have enough people searching, get the others to assemble probes and shovels to save time. If another group or person joins the rescue, you should take care to ensure that they do not slow down your search. One key thing is to check that everyone is on search mode. It is almost always a good idea to accept help from another group in the area. More rescuers, if properly managed, will speed up the rescue (especially when shovelling).