Call the same destination with Google Voice and then with Anveo, each time noting the Audio Codec line in the OBi Call Staus. Google Voice uses G711. Does Anveo use G711 also or does it use G729? Audio quality with G711 is considerably better than with G729.
Thanks Ron, I guess it is G771:
Sip Registration Details
Username: 3657xxxxxx
Password:
SIP Registration Server/Proxy (USA): sip.anveo.com:5010
NEW SIP Registration Server/Proxy (Germany): sip.de.anveo.com:5010
NEW SIP Registration Server/Proxy (Canada): sip.ca.anveo.com:5010
Supported codecs: G.711 ulaw (PCMu), GSM
Protocol: UDP, TCP (only available on premium subscription plans: Starter and up)
Additional information which might be helpful
Realm: anveo.com
Port: 5010