Multi-Tech Systems MultiVOIP GSM SIP-to-Cellular Gateways MVPGSM-2 ユーザーズマニュアル

Chapter 4: Configuring your MVPGSM 

Multi-Tech Systems, Inc. 

MVPGSM 

30 

Default 

-- 

When this button is clicked, all Voice/FAX parameters are set to their default 
values. 

Select Channel 

1-2 

Channel to be configured is selected here.

Copy Channel 

-- 

Copies the Voice/FAX attributes of one channel to another channel. 

Voice Gain 

-- 

Signal amplification (or attenuation) in dB.

Input Gain 

+31dB to 
 –31dB 

Modifies audio level entering voice channel before it is sent over the IP network to 
the remote SIP device. The default & recommended value is 0 dB. 

Output Gain 

+31dB to 
 –31dB 

Modifies audio level from IP to the voice channel.  The default and recommended 
value is 0 dB. 

DTMF Gain 

-- 

The DTMF Gain (Dual Tone Multi-Frequency) controls the volume level of the DTMF 
tones sent out for Touch-Tone dialing.  

DTMF Gain, 
High Tones 

+3dB to  
-31dB & 
“mute” 

Default value:  -4 dB.  Not to be changed except under supervision of Multi-Tech
Technical Support. 

DTMF Gain, Low 
Tones 

+3dB to  
-31dB & 
“mute” 

Default value:  -7 dB.  Not to be changed except under supervision of Multi-Tech
Technical Support. 

DTMF Parameters 

 

Duration (DTMF)  60 – 3000 

ms 

When DTMF: Out of Band is selected, this setting determines how long each DTMF 
digit ‘sounds’ or is held.  Default = 100 ms. 

DTMF 
In/Out of Band 

Out of 
Band, or 
Inband 

When DTMF Out of Band is selected, the MultiVOIP GSM detects and regenerates 
DTMF tones. When DTMF Inband is selected, the DTMF digits are passed through 
the MultiVOIP GSM unit as they are received. 

Out of Band 
Mode 

RFC 2833, 
SIP Info 

RFC2833 method.  Uses RTP mode defined in RFC 2833 to transmit the DTMF digits. 
SIP Info method.  Generates DTMF tones on the telephony call leg.  The SIP INFO 
message is sent along the signaling path of the call. You must set this parameter per 
the capabilities of the remote endpoint with which the VOIP will communicate.  The 
RFC2833 method is the more common of the two methods. 

FAX Parameters – This section is grayed-out as Fax is not supported by the wireless channels 

Fax Enable  

 

 

Modem Relay 
Enable 

 

 

Max Baud Rate 
(Fax)   

 

 

Fax Volume  
 

 

 

Jitter Value (Fax)   

 

 

Mode (Fax)