Configuring a SIP Gateway Trunk

help • 19 SIP Gateway Links • Configuring a SIP Gateway Trunk

19.5 Configuring a SIP Gateway Trunk

When you have created a SIP gateway trunk as described in 19.4 Creating a SIP Gateway Trunk, you can subsequently change the settings of this trunk in the SwyxWare Administration.

When parameters of a trunk are changed, this change takes effect at once. There is no need to halt and restart any services for this.

How to configure a SIP gateway trunk

1 Open the SwyxWare Administration and choose the SwyxServer.

2 In the left side of the SwyxWare Administration window, click on "Trunks", and in the right-hand window select the trunk you want to configure.

3 In the context menu, select "Properties".

In each case, the "Properties of..." window will appear.

Any changes to the configuration of a SIP gateway trunk must also be made in the configuration of the gateway.

The "General" Tab

In this tab you can modify the name and description of the trunk.

Trunk information:

In the fields "Trunk Name" and "Description" you will find the descriptive information that is displayed in Administration.

The field "Computer Name" contains the name of the computer in which the service (LinkManager or SwyxGate) is installed.

The "Type" field indicates the type of the trunk, and "Trunk Group" the assigned Trunk Group. Both parameters cannot be retrospectively changed.

Using "Trunk Group Properties..." You will open the Properties of the according Trunk Group. You can edit the Properties of the Trunk Group directly.

Trunk status:

If you deactivate the checkbox "Trunk enabled", this gateway is blocked for further incoming or outgoing calls.

It won't be written in the change log, if a trunk was activated or deactivated.

The "SIP Registration" Tab

The SIP access parameters of the gateway, which the latter will use to establish a connection to the SwyxServer, appear on this tab.

Enter the parameters the SIP gateway needs to log on to SwyxServer via this trunk.

SIP User ID:

The user ID is combined with the realm to create the SIP address (URI).

SIP Authentication method:

Indicate whether or not the gateway needs to authenticate itself.

SIP user name and password:

The user name and password are required for authentication.

The "Numbers" Tab

The following settings can be made:

Public numbers of this trunk

You can specify here which public numbers this trunk uses. External calls to these numbers go over this trunk. Calls with a Calling Party Number that is assigned to this trunk are routed over this trunk.

To ensure the unambiguity of the information, you must enter the complete phone number from SwyxWare V.13.20 onwards. In the new "Subscriber number" input field, enter the part of the phone number that follows the area code and precedes the extension (internal phone number).

	Country code	Area code	Subscriber number	First extension	Last extension
e. g.	49	231	4777	100	200

This is how you add numbers for this trunk

The existing phone number entries are automatically extended by the new entry field "Subscriber number" when updating to V.13.20. Make sure that the automatic allocation is correct and adjust the corresponding entries manually as required.

1 Click on "Add".

The "Public numbers" window will appear.

2 You can add either an individual number or a range of numbers.

3 End your inputs with "OK".

To add several numbers or ranges, simply select "Add" the relevant number of times.

"Number signaling" tab

The following settings can be made:

Always suppress number

In this case no number is signaled to the person being called (XXX), regardless of which number was configured for this trunk.

In Germany, the destination numbers 110 and 112 are reserved for emergency calls. The outgoing call number to these destination numbers is always signaled.

Always Use This Number:

You can specify a number or SIP-URI here which will always be signaled to the person being called (e.g. the operator's number), regardless of which number was configured for this trunk.

The number must be entered in canonical number format.

Signal Caller Number

Although the caller number is not configured for this trunk, the caller number is signaled to the person being called.

Example:

Customer A (number 88 333 44) calls employee B (number 55 666 77). Forwarding to his mobile phone is activated, i. e. an incoming call is routed outwards again. If the customer's number (88 333 44) should also be signaled externally, then this can be allowed here, although this number was not defined for this trunk.

Use:

You can specify here which number this trunk uses. You can specify the action for numbers that are assigned to this trunk as well as for numbers which have no assignment.

Use:	If assigned to this trunk, otherwise:	If assigned to this trunk, otherwise:	Entry
Origination Number	Number of the transferor
	Hide number
	Don't use this trunk
	Use the following number		<Number>
Number of the transferor	Origination Number	Hide number
		Don't use this trunk
		Use the following number	<Number>
	Hide number

For Number Signalling, the line characteristic "Clip no Screening" must be enabled on the line, otherwise the number is suppressed.

The "Codecs/Channels" Tab

The following settings can be made:

Codecs

Here you can define the type of compression to be used on this connection.

Specify which Codecs should be permitted for this trunk.

Voice, low bandwidth (G.729)

High compression. A voice connection requires approximately 24 kbits/s.

Voice, highest bandwidth (G.722)

HD quality

Voice, high bandwidth (G.711a, G.711µ)

The voice data is slightly compressed. This keeps the packet delay time in the LAN (Local Area Network) to a minimum. A voice connection requires approximately 64 kbits/s.

Fax over IP

In this case, the special fax protocol T.38 is used, which takes the set-up of the IP network into consideration. A fax connection using T.38 requires approximately 20 kbits/s.

Click on "Next>".

If there are several voice codecs selected, SwyxServer will filter voice data according to the current settings. The communicating sides will have to decide which voice codec to use.

It won't be written in the change log, if a Codec was activated or deactivated. See 7.7 Change log.

Action on fax receipt

When a fax connection is set up, the T.38 protocol is negotiated between the two devices involved. Certain variants of this negotiation may not be supported by some IP adapters. Use the following filter options to establish compatibility with such devices.

Remove T.38 codec from initial invite

Some IP adapters cannot correctly interpret an initial connection request which includes T.38 as well as voice Codecs.

If this option is set, SwyxServer removes T.38 from the initial connection request. The fax devices first set up a voice connection and then switch to the fax protocol T.38 because of the fax tone (CED tone, 2100Hz).

Prohibit T.38 reinvite by sender

The receiving fax device switches to T.38 after detecting the fax tone (CED tone, 2100Hz). Alternatively, the switch to T.38 can be carried out by the sending fax device.

Some IP adapters don't support switching by the sender.

If this option is set, SwyxServer suppresses a switch to T.38 by the sender.

If the receiving side involves a combined phone/fax device (fax switch), a fax data transmission is impossible when the option "Prohibit T.38 reinvite by sender" is activated.

The filter options can only be set when the Codec "Fax over IP (T.38...)" is activated.

Channels

Specify how many channels (connections) should be routed simultaneously via this trunk and forwarded from there to the public network. You can also determine how many outgoing and/or ingoing connections are established at most.

The maximum number is determined by the gateway used.

If channels were added or removed, you will find these changes in the change log.