16.4 Creating a SIP Trunk
Once you have the information you need from your provider in respect of the SIP connection and a SIP trunk group has been set up, you can proceed to create SIP trunks.
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The SwyxLinkManager service, which is responsible for linking SIP lines, is automatically installed with the standard version of the SwyxServer software.
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How to create a SIP trunk
1 Open the SwyxWare Administration and choose the SwyxServer.
2 In the left side of the SwyxWare Administration window, click with the right mouse button on "Trunks" and select the entry "Add Trunk…" in the context menu.
3 An "Add new Trunk Wizard" opens up.
Click on "Next>".
4 Trunk name:
Enter a name and a short description for the new trunk here.
Click on "Next>".
5 Selection of a trunk group:
Select the trunk group here to which this trunk should be assigned.
General settings such as routings, rights and location-specific parameters are specified in the trunk group. You can use "New Trunk Group..." to create a new trunk group, and then continue with the creation of a trunk.
Click on "Next >".
6 SIP trunk provider/User data
Enter the user data you obtained from your SIP provider here.
SIP provider
This is purely an information field (the SIP provider is defined in the configuration of the trunk group).
User ID:
The user ID is combined with the realm to create the SIP address (URI).
User name and password:
The user name and password are required for user authentication.
7 Numbers:
Please enter the Public Numbers to be routed by this Trunk..
If your provider has configured several numbers or ranges of numbers for you, enter only one number or one range here, and add the others subsequently in the trunk properties (
The "Numbers" Tab).
8 SIP-URI
Enter the SIP addresses (URIs) to be managed by this trunk here. A SIP has the following format:
SIP:<Name 1>@<Name 2>
where <Name 1> represents the user name and <Name 2> the realm. Although the realm is set by default when the trunk group is selected, it can be overwritten individually here.
To make things easier, you can use '*' as a placeholder, e.g., enter '*@company.com' for all users with the realm 'company.com'.
9 Codecs:
With the help of the Codec you select how the voice is compressed for transmission. The following options are available:
If the Codec priority "Prefer Quality" is selected, the Codecs are provided in the sequence G.722, G.711a, G.711µ, G.729 or Fax over IP. Specify the filter(s) you want:
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 64kbits/s.
Voice, low bandwidth (G.729)
High compression. A voice connection requires approximately 24kbits/s.
Fax
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 20kbits/s.
If the Codec priority "Prefer low bandwidth" is selected, the Codecs sequence changes to G.729, G.722, G.711a, G.711µ, Fax over IP. The aim here is to use as little bandwidth as possible. Here too, specify the filter(s).
Click on "Next>".
10 Voice channels:
Enter how many calls may be routed via this trunk at the same time.
Using a SIP trunk, the provider will define how many connections at the same time will be possible. The maximum number of channels will be defined by the bandwidth to the provider and the Codec settings (i. e. the bandwidth per call).
11 Computer name:
Enter the name of the computer on which the SwyxLinkManager is managed. Use the name of the computer as it appears in the computer properties.
12 Click "Finish".
The new Trunk is created, and is available for further configuration.
