What do you do if you lose internet connection during an important phone call at work?

If during an important phone call the internet connection drops, I:

1. Remain calm and inform the interlocutor about the problem if possible.
2. Switch to mobile network or use cellular communication if the call was via VoIP.
3. Restart network equipment or switch to another available internet source.
4. If the connection is not restored quickly, suggest to call back later or use alternative communication channels (e.g., mobile phone call).

It is important to have backup communication options and to warn colleagues about possible technical issues in advance.