Grandstream Device Configuration
Basic Configuration:
Profile Active:   No      Yes
Primary SIP Server:   (e.g.,, or IP address)
Failover SIP Server:   (Optional, used when primary server no response)
Prefer Primary SIP Server:   No      Yes      ( yes - will register to Primary Server if Failover registration expires)
Outbound Proxy:   (e.g.,, or IP address, if any)
SIP Transport:   UDP       TCP       TLS   (default is UDP)
NAT Traversal (STUN):   No      No, but send keep-alive     Yes
              Advance Configuration:
DNS Mode:   A Record      SRV      NAPTR/SRV
SIP Registration:    No       Yes
Unregister On Reboot:    No       Yes
Outgoing Call without Registration:    No       Yes  
Register Expiration:   (in minutes. default 1 hour, max 45 days)
SIP Registration Failure Retry Wait Time:   (in seconds. Between 1-3600, default is 20)
Local SIP port:   (default is 5060 for UDP and TCP; 5061 for TLS)
Local RTP port:   (1024-65535, default 5004)
Use Random Port:   No      Yes
Refer-To Use Target Contact:   No      Yes
Transfer on Conference Hangup:   No      Yes
Disable Bellcore Style 3-Way Conference:   No       Yes (Using star code *23 for 3-way conference)
Remove OBP from Route Header:   No      Yes
Support SIP Instance ID:   No      Yes
Validate Incoming SIP Message:   No      Yes
Check SIP User ID for incoming INVITE:   No      Yes (no direct IP calling if Yes)
Allow Incoming SIP Messages
from SIP Proxy Only:
  No      Yes (no direct IP calling if Yes)
SIP T1 Timeout:  
SIP T2 Interval:  
DTMF Payload Type:  
Preferred DTMF method:
(in listed order)
  Priority 1:  
  Priority 2:  
  Priority 3:  
Disable DTMF Negotiation:   No (negotiate with peer) Yes (use above DTMF order without negotiation)
Send Hook Flash Event:   No      Yes   (Hook Flash will be sent as a DTMF event if set to Yes)
Enable Call Features:   No      Yes (if Yes, call features using star codes will be supported locally)
Use NAT IP:   (used in SIP/SDP message if specified)
Use SIP User-Agent Header:  
Ring Timeout:   (10-300, default is 60 seconds)
Hunting Group Ring Timeout:   (5-300, default is 20 seconds)
Hunting Group Type:   Circular    Linear    Parallel    Shared Line
Delayed Call Forward Wait Time:   (Allowed range 1-120, in seconds.)
No Key Entry Timeout:   (in seconds, default is 4 seconds)
Early Dial:   No       Yes   (use "Yes" only if proxy supports 484 response)
Dial Plan Prefix:   (this prefix string is added to each dialed number)
Use # as Dial Key:   No       Yes   (if set to Yes, "#" will function as the "(Re-)Dial" key)
Dial Plan:  
SUBSCRIBE for MWI:   No, do not send SUBSCRIBE for Message Waiting Indication
  Yes, send periodical SUBSCRIBE for Message Waiting Indication
Send Anonymous:   No       Yes   (caller ID will be blocked if set to Yes)
Disable Call-Waiting:    No       Yes
Disable Call-Waiting Caller ID:    No       Yes
Disable Reminder Ring for On-Hold Call:    No       Yes
Anonymous Call Rejection:   No       Yes  
Session Expiration:   (in seconds. default 180 seconds)
Min-SE:   (in seconds. default and minimum 90 seconds)
Caller Request Timer:   No     Yes (Request for timer when making outbound calls)
Callee Request Timer:   No     Yes (When caller supports timer but did not request one)
Force Timer:   No     Yes (Use timer even when remote party does not support)
UAC Specify Refresher:   UAC   UAS     Omit (Recommended)
UAS Specify Refresher:   UAC   UAS (When UAC did not specify refresher tag)
Force INVITE:   No     Yes (Always refresh with INVITE instead of UPDATE)
Enable 100rel:   No     Yes
              Codec Configuration:
Preferred Vocoder:
(in listed order)
  choice 1:  
  choice 2:  
  choice 3:  
  choice 4:  
  choice 5:  
  choice 6:  
VAD:   No       Yes
Jitter Buffer Type:   Fixed   Adaptive
Jitter Buffer Length:   Low     Medium   High
SRTP Mode:   Disabled     Enabled but not forced   Enabled and forced
G723 Rate:   6.3kbps encoding rate       5.3kbps encoding rate
Use First Matching Vocoder in 200OK SDP:   No      Yes
iLBC Frame Size:   20ms       30ms
iLBC Payload Type:   (between 96 and 127, default is 97)
Voice Frames per Packet:   (up to 10/20/32/64 for G711/G726/G723/other codecs respectively)
Symmetric RTP:   No       Yes
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