Installation and Operation Manual

Table Of Contents
TD 92579EN
10 April 2015 / Ver. N
Installation and Operation Manual
IP-DECT Base Station & IP-DECT Gateway (software version 7.2.X)
59
6 To view a list of DECT handsets where early encryption is in use: Select Users >
Users and then click "Show". Those DECT handsets where early encryption is in use
is indicated with a dot in the column EE (Early Encryption).
4.5.13 Configure Coder
Select the preferred coder, and enter the desired frame length. If exclusive is selected for
the coder the IPBS/IPBL is forced to use that coder. With Silence Compression enabled no
information is sent during pauses in the conversation, this is used to save bandwidth.
Note: When exclusive is enabled for a coder it might be impossible to make calls outside
the IP-DECT system.
1 Select DECT > System.
Note: To access the System tab, the Master mode has to be activated, see
4.5.16 Select Mode on page 62.
2 Choose the applicable coder in the Coder drop-down list.
NOTE: The G726-32 coder is not supported by SIP.
3 Enter the sample time in milliseconds in the Frame text field.
4 Choose Exclusive enabled or disabled by selecting/clearing the Exclusive check box.
5 Choose Silence Compression enabled or disabled by selecting/clearing the SC check
box.
6 Click "OK".
4.5.14 Secure RTP
This option makes it possible to encrypt media streams. The encryption is activated if the
SRTP is also enabled in the IP-PBX. For additional privacy it is recommended to use the
encrypted signalling protocol (SIPS) as well to hide the exchange of the SRTP keys.
Note: If SRTP is enabled one Radio can handle maximum 5 calls for each IPBS1, 20 calls
for each IPBS2 and 40 calls for each IPBL (including relayed calls) at the same time. For this
reason and because of the high load on the CPU when SRTP is used, it is recommended to
deactivate the Radio in the Master.
1 Select DECT > System.
Note: To access the System tab, the Master mode has to be activated, see
4.5.16 Select Mode on page 62.
2 To enable SRTP: Select in the Secure RTP drop-down list a cryptographic suite. The
numbers in the list refer to key-length/sha1 hash-length.
To disable SRTP: Select in the Secure RTP drop-down list the empty row at top.
3 Click "OK".
If a call is successfully encrypted a lock icon appears next to the ongoing call description in
the Traffic > Master Calls section.
The maximum amount of media streams are as follows depending on if SRTP is enabled or
not:
IPBS1: 20 RTP
IPBS1: 5 SRTP
IPBS2: 20 RTP
IPBS2: 20 SRTP