For each SIP Phone or device you add, please increment the Local SIP UDP Port and RTP Port values by 100: Most devices are pre-configured on the following ports:
- Local SIP Port: 5060
- Local RTP Port: 5004
- Local SIP Port: 5160
- Local RTP Port: 5104
- Listen SIP Port: 5260
- Listen RTP Port: 5204
In Snom device settings the Listen SIP Port is called the 'Network Identity Port'.
Some devices call the Listen RTP Ports 'Media Ports'.
If your SIP Device requires a Start and End Listen RTP Port to be specified, please use RTP port ranges for your devices of the form 5004-5020, 5104-5120, etc.
Some multi-line SIP devices used a Global Listen SIP Port (e.g Siemens Gigaset and Snom devices).
For other multi-line devices each active Account or Line on the device will use a different Listen SIP Port (e.g. Grandstream, Yealink deskphones, Cisco and Linksys Small Business devices).
Please continue the above incremental port numbering for devices that allow each Account or Line to be given a different Listen SIP Port.