Polycom DOC2585A - Manual (Page 57)

Polycom RMX 1500/2000/4000 Getting Started Guide
2-27
6 Click Next.
7 Select the IP Network Type: H.323, SIP or H.323 & SIP.
8 Click Next.
9 If you selected SIP only, go to Step 13.
10 Enter the required Gatekeeper information in the dialog box.