Our VoIP platform automatically converts between codecs, so most devices work with their default settings. For the best call quality put G.722 first.
| Type | Supported |
|---|---|
| Voice | G.722 (HD wideband), G.711 A-law, G.711 u-law, GSM, iLBC, G.729, G.726 |
| Video | H.264, H.263 (app-to-app video calls) |
| Fax | T.38 pass-through and termination (redundancy mode) |
| DTMF | RFC 2833 preferred, or SIP INFO |
Fax machines
A fax machine can be connected through a VoIP adapter (ATA) that supports T.38. Enable T.38 on the ATA, set the fax machine to a slower speed (9600 bps) and turn off error correction mode (ECM) if pages fail. For occasional faxes, a fax-to-email service is simpler – ask us.
Still need help? Email [email protected] or log a ticket in the customer portal.