Specifications

TD 92326GB

2009-03-10 / Ver. E

Installation and Operation Manual

VoIP Gateway

4 Click “OK”.

12.4.1 Call Number Mapping

Call number mapping is made for incoming calls, for example adding leading zeros, or 9 in

US. Refer to chapter 20.1 Dealing with the various ISDN address types on page 142.

1 Select Gateway > GK.

2 For the interface that you want to set up call number modifications on, click the

“+” sign next to the interface name. A new window opens and call number

mapping can be made for the VoIP interfaces.

Figure 72. Call number mapping for VOIP interfaces

H.323 Interop Tweaks In addition to the standard fields, several advanced

settings are available in the H.323 Interop Tweaks

section. They are normally not necessary and are merely

used to solve compatibility problems with some PBXs.

Read chapter 19.1.3 H.323 Interop Tweaks on page

136 for information of the following settings.

• No Faststart A checked check box disables the H.245 faststart

procedure. Outgoing calls are made without faststart,

incoming calls with and without faststart are answered

without faststart.

• No H.245 Tunneling A TCP connection of its own is established for the voice

data connection negotiation. Only recommended if

compatibility problems occur with third party products.

• Suppress HLC Suppresses the transmission of “high layer

compatibility” information elements on the interface.

See 22.7 Suppression of specific Protocol Elements on

page 156.

• Suppress FTY Suppresses the transmission of “facility information

elements” on the interface. See 22.7 Suppression of

specific Protocol Elements on page 156.

• Suppress Subaddress Suppresses the transmission of “Subaddresses” on the

interface.

a. The value defines the period of time for collecting voice data prior to transmitting it as a

voice data packet. Voice transmission is delayed correspondingly. A value of 30 ms is perceived

by the human ear as virtually without delay, a value of 100 ms similarly, does not irritate most

users.

b.Saves bandwidth by not transmitting any data during pauses in speech. Considerable band-

width can be saved in this way, since only one party usually speaks at a time during a conver-

sation. This function can usually be activated without any loss of quality.

Figure 81.