User manual

GSM VOIP Gateway Series

GSM VOIP Gateway USER MANUAL – Rev1 – Technical Support: technical@witura.com

F. H245 Tunnel

This parameter is set for the special requirements of some customers. If you are

not sure, do not set this parameter.

G. Registration Mode

This parameter is used to comply with different PBXs and is not set normally.

H. DTMF Signals

DTMF signals are used to transmit call signals to the call switching center over the

audio band. The DTMF means that two different frequencies of sounds are

combined to 16 types of dialing tones. The telecom office or 1860 service hotline

identify these dialing tones by analyzing the DSP, and thus determining the

dialing number. There are two types of DTMFs: in-band DTMF and out-band DTMF.

1) In-band DTMF

The in-band DTMF transmit s dialing tones and call voices together, without any

processing. Therefore, the in-band DTMF transmits DTMF signals through a single

way.

2) Out-band DTMF

The out-band DTMF transmits dialing tones over protocols, such as RFC2833,

which can ensure the validity of the transmission.

I. Signaling QoS

Quality of Service (QoS) is a network’s capacity to provide priority services,

including the special bandwidth, jitter control and delay (used for real-time and

interactive traffic), and improvement of the packet loss ratio. This parameter is

used to mark the specified QoS label for the call signaling packet to increase the

network service quality.

GSM VOIP Gateway Series

GSM VOIP Gateway

USER MANUAL –

Rev1

–

Technical Support: technical@witura.com

The trunk agent protocol supports encryption on communications over the

gateway. The H323 trunk agent protocol supports encryption on signaling in

different modes (for detail s about the agent mode, see section 3.5.6.3 “Media

NAT Traversal”).

Note: This feature needs the support of the server developed by Witura

Corporation Sdn Bhd

The traversal of SIP signaling over NAT (firewall) is classified into:

A. No

The mechanism of firewall traversal is not supported.

B. STUN (RFC 3489)

The Simple Traversal of UDP over NAT (STUN) is a protocol that enables the SIP

phone to detect the existence and type of the firewall installed in the computer.

This parameter indicates the SIP address of the STUN server.

3.5.6.2 Traversal Of SIP Signaling Over NAT