Grandstream Networks UCM6510 User Manual page 177

Advanced Settings
Codec Preference
From Domain
From User
Send PPI Header
Send PAI Header
Outbound Proxy Support
Outbound Proxy
DID Mode
DTMF Mode
Firmware Version 1.0.10.39
only). The default setting is disabled. The recording files can be accessed
under web GUI->CDR->Recording Files.
Select audio and video codec for the VoIP trunk. The available codecs
are: PCMU, PCMA, GSM, AAL2-G.726-32, G.726, G.722, G.729, G.723,
ILBC, ADPCM, H.264, H.263, H.263p.
Configure the actual domain name where the extension comes from. This
can be used to override the From Header.
For example, "trunk.UCM6510.provider.com" is the From Domain in From
Header: sip:1234567@trunk.UCM6510.provider.com.
Configure the actual user name of the extension. This can be used to
override the From Header. There are cases where there is a single ID for
registration (single trunk) with multiple DIDs.
For example, "1234567" is the From User in From Header:
sip:1234567@trunk.UCM6510.provider.com.
If enabled, the SIP INVITE message sent to the trunk will contain PPI
(P-Preferred-Identity) header. The default setting is "No".
Note:
"Send PPI Header" and "Send PAI Header" cannot be enabled at the
same time. Only one of the two headers is allowed to be contained in the
SIP INVITE message.
If enabled, the SIP INVITE message sent to the trunk will contain PAI
(P-Asserted-Identity) header. The default setting is "No".
Note:
"Send PPI Header" and "Send PAI Header" cannot be enabled at the
same time. Only one of the two headers is allowed to be contained in the
SIP INVITE message.
Select to enable outbound proxy in this trunk. The default setting is "No".
When outbound proxy support is enabled, enter the IP address or URL of
the outbound proxy.
Configure where to get the destination ID of an incoming SIP call, from
SIP Request-line or To-header. The default is set to "Request-line".
Configure the default DTMF mode when sending DTMF on this trunk.

Default: The global setting of DTMF mode will be used. The global
setting for DTMF Mode setting is under web UI->PBX->SIP
Settings->ToS.

RFC2833: Send DTMF using RFC2833.
UCM6510 IP PBX User Manual Page 176 of 339