Renumber port 1 to a placeholder
Renumber port 2 to port 1's old number
Renumber Port 1 to port 2's old number


Brand new installation I will number my ports 7011~7018 on card 1. 7021~7028 on card 2. 7031~7038 on card 3, 7041~7048 on Card 4. 7101~7130 on Expansion 1, etc. By the number, you know exactly which card or module it is on, and which port on the card or module. Install phones, hot desk in extension number (simpler short code can be created so it's just *#xxx), then square up the actual extension numbers when you're done.