Entering the conversation in ringing tones? (7,2)

I believe the answer is:

chiming in

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'entering the conversation' is the definition.
The definition and answer can be both to do with communicating as well as being present participle verbs.
Perhaps you can see a link between them that I can't see?

'ringing tones?' is the wordplay.
'ringing' becomes 'chiming' (I've seen this before).
'tones?' becomes 'in' (I can't justify this - if you can you should give a lot more credence to this answer).
'chiming'+'in'='CHIMING IN'

'in' is the link.

Can you help me to learn more?

I've seen this clue in the Evening Standard.

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