How do you encourage your team members to pick up the phone when a high priority situation arises. They tend to always use email/instant message and assume the recipient has got the message, no follow up phonecall or heads up that you have an important message to deal with.
I sometimes think some of my team would send the fire brigade an email requesting help if the building was on fire.
We use skypeout for phone calls and all team members have direct mobile numbers stored in that account (so it is easy to get a hold of someone's number).
We actually prefer email/instant message for less urgent communications (as it doesn't interrupt our programmers during their normal work).
To date with have discussed this with team members ad naseum, and also issued guides & emails.