Version 6.2 577 February 2011
SIP User's Manual 8. IP Telephony Capabilities
¾ To configure RTP-SRTP transcoding:
1. Open the 'IP Profile Settings' page (Configuration tab > VoIP menu > Coders And
Profiles submenu > IP Profile Settings).
2. Configure RTP-SRTP transcoding mode for IP Profile #1 (i.e., LAN users):
a. From the 'Profile ID' drop-down list, select '1'. This is the IP Profile defined in
previous examples for LAN users.
b. From the 'SBC Media Security Behaviour', select 'As Is'. This allows the device to
simply send the packet as received (RTP or SRTP). In other words, no
transcoding is performed for LAN users.
c. Click Submit.
Figure 8-93: RTP-SRTP Transcoding Mode for LAN Users
3. Configure RTP-to-SRTP transcoding for IP Profile #2 (i.e., ITSP):
a. From the 'Profile ID' drop-down list, select '2'.
b. From the 'SBC Media Security Behaviour', select 'SRTP'. This ensures that RTP
packets received from LAN users are sent to ITSP as SRTP.
c. Click Submit.
Figure 8-94: RTP-to-SRTP Transcoding for ITSP
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