Siemens HIPATH 8000 - Manual (Page 104)

Extended Administration
104
Additional feature: continuous connection verification
This mechanism is used to check whether there is still a TLS connection,
also then when the phone is not in use. If it determines that the original
server is not reachable, the phone can switch to a redundant server (if e.g.
DNS-SRV is used). This reduces longer waiting times for the user if the
phone would have to first register with the redundant server for the next
call and the call is then set up.
Implementation
optiPoint 410/420 SIP telephone settings
The following settings must be performed on the telephones for which
voice encryption is to be enabled:
• Set payload security to allowed (Æ page 144)
• Set connectivity check interval as required (Æ page 144)
– (0, when deactivated; 10-3600 = duration of verification in seconds;
1-9 = 10; >3600 = 3600)
• Set SIP server validation as required (Æ page 144)
• Set SIP transport to TLS (Æ page 115)
• Set SIP port to 5061 (Æ page 115)
The same settings can also be performed using the telephone menu. In
the case of web settings, references to the corresponding locations are
provided.
TLS verified TLS verified