Additional Information 
9 RN-001037-02 REV03 – 06.2011
Configuring Persistent TLS Keep-Alive 
Use the following parameter to configure the persistent TLS keep-alive feature:
Custom Ad Hoc Conference
Previously, the phone will wait for server response prior to completing the ad hoc and 
centralized conference feature. This results in an interoperability issue with certain call 
managers, such as Genband. Now the phone no longer waits for server response 
before referring the call to the conference host when the "custom adhoc conference" 
parameter is enabled.
Configuring Custom Ad Hoc Conference
Use the following parameters to configure the custom ad hoc conference:
Parameter– 
sip persistent tls keep alive 
Configuration Files aastra.cfg, <mac>.cfg
Description When enabled, the configured value indicates frequency (in seconds) 
that phone will send the keep alive messages.
Format Integer
Default Value 0 (disabled)
Range 0-3600
Example sip persistent tls keep alive: 10 
Parameter– 
custom adhoc conference 
Configuration Files aastra.cfg, <mac>.cfg
Description Enables/disables the phone to interoperate with Genband Call 
Manager for ad hoc conference.
Format Boolean
Default Value 0
Range 0-1
0 (disable)
1 (enable)
Example custom adhoc conference: 1