You need to add a Softphone Device to your Vonage Extension. Vonage allow up to 3 devices on an Extension. See here for details of how to do this.
The following table highlights the specific settings you should apply in Dynamics Telephony:
| Dynamics Telephony Tab | Dynamics Telephony Setting | Value | Comment |
| Provider Configuration |
DTMF Mode | DM_Outband | This is RFC 2833 |
| Expires | 1800 | ||
| Provider Account |
Username | e.g. VH123456 | SIP/Authorization ID |
| Password | SIP Password | ||
| Host Name | E.g. sip-1234.accounts.vocalocity.com | Registrar | |
| Domain Name | * | A single asterisk ‘ * ‘ | |
| Transport Mode | TM_UDP |