Say what is happening now.
If your team is on other calls, say so. Avoid stating an exact waiting time or queue position unless the system can provide it reliably. Even “you are next” creates an expectation. A calm request to stay on the line may be more accurate.
Separate the first message from reminders.
You do not need to repeat the full introduction every time. Plan an entry message and a shorter reminder. The interval depends on your phone system. Listen to several repetitions in a row: a friendly sentence can become tiring if it plays too often.
Check speech and music together.
The words must remain clear over a phone speaker. Background music should support the speech. Check the final mix with a real test call and use music within the agreed usage rights for your project.
Plan how waiting ends.
Agree what happens if nobody answers: voicemail, a monitored alternative or another call during office hours. Configure queue limits, transfers and out-of-hours behaviour separately in your phone system, then test them.