if there is no audio on both end then there could be an possible issue with the media resource/capability such as Codec negotiation, since the call is established with no audio. let us know the model of phones you are using and the call agents for furhter analysis.
if its Cisco IP Phones then toggle twice on the (?) button to see what all codecs are being advertised by the phones. you can follow the below threads to collect the packet captures from both the phones and the switch it is connected to get the packet flow.
1. Log into CLI of DNAC:
ssh maglev@< DNAC appliance IP> -p 2222
2. Run this curl command to get token to get member id:
curl -X POST -u admin:<admin user password> -H -V https://<CLUSTER-IP>/api/system/v1/identitymgmt/token
Enterprise Switching Business Unit is glad to announce Beta release 16.12.2 for all Catalyst 9200/9300/9400/9500/9600 and Catalyst 3650/3850 Platforms. This release is made available to allow users to test, evaluate and share fee...
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