During a call connection you might experience Long Delay to hear the Ring back tone or No Ring back tone at all
What To Check
We advise our customers to use the Teams Desktop Client as it provides real-time communications support (audio, video and content sharing) for team meetings. group calling and private one-on-one calls hence causing No Delay in the Early Media
Please Note: We do not generate any local ringtone, and pass on what we receive from Microsoft
If the above steps do not reveal the issue, or you need to know what you can do to address the problem, please raise a case to us including any trace captures and the call url from the call log in the portal providing us with the Teams Call Logs.