Application Guide
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DP750/DP720 Administration Guide 
Version 1.0.3.37 
SIP Registration 
Controls whether to send  SIP REGISTER messages to the proxy server. Device 
may not be able to make/receives calls if disabled. Default is Yes.     
Unregister on 
Reboot 
Controls whether to clear SIP user’s information by sending un-register request to 
the  proxy server.  The  un-registration  is  performed by  sending  a  REGISTER 
message  with  “Contact”  header  set  to  *  and  Expires=0  parameters  to  the  SIP 
server. This will unregister all SIP accounts under concerned Profile. Default is No. 
Add Auth Header 
on Initial REGISTER 
Adds  “Authentication”  header  with  blank  “nonce”  attribute  in  the  initial  SIP 
REGISTER request. Default is No. 
Outgoing Calls 
Without 
Registration 
Enables the ability to place outgoing calls even when not registered (if allowed by 
ITSP);  device  will  not  be  able  to  receive  incoming  calls.  Any  HS  member  of  a 
hunting  group  that  is  not  registered  with  a  SIP  account,  will  be  able  to  place 
outbound calls using the SIP credentials of the primary hunting group HS.   
For  example:  HS 1,  3  and  5  are  members  of the  same  Hunting Group.  HS  1  is 
registered with a SIP account. HS 3 and 5 are not registered.    HS 3 and 5 will be 
able to place outbound calls using the SIP account of HS 1, even if Outgoing Call 
without Registration is set to No. Default is No.     
Register Expiration 
Refreshes registration periodically with specified SIP proxy (in minutes). Maximum 
interval is 65535 minutes (about 45 days). Default is 60 minutes (or 1 hour). 
SIP Registration 
Failure Retry Wait 
Time 
Sends re-register request after specific time (in seconds) when registration process 
fails. Maximum interval is 3600 seconds (1 hour). Default is 20 seconds. 
SIP Registration 
Failure Retry Wait 
Time upon 403 
Forbidden 
Sends re-register request after specific time (in seconds) when registration process 
fails due to “403 Forbidden”. Valid range is 0 to 3600 in second. 0 second means 
stop retry registration. Default is 1200 seconds. 
Reregister Before 
Expiration 
Sends  re-register  request  after  specific  time  (in  seconds)  to  renew  registration 
before the previous registration session expires. 
Local SIP Port 
Defines  local port  to  use  by  the base  for  listening  and  transmitting  SIP packets. 
Default value for Profile 1 is 5060, 6060 for Profile 2, 7060 for Profile 3 and 8060 
for Profile 4. 
Use Random SIP 
Port 
Controls whether to use configured or random SIP ports. This is usually necessary 
when multiple base stations are behind the same NAT. Default is No. 
Local RTP Port 
Defines local RTP port used to listen and transmit RTP packets. Default is 5004. 
SIP T1 Timeout 
Defines T1 timeout value. It is an estimate of the round-trip time between the client 
and  server  transactions.  For  example,  the  base  station  will  attempt  to  send  a 










