help • 8 Trunks  • Edit trunks
8.4 Edit trunks
You can adjust the settings you specified when you created the trunk. You can also specify other settings.
* 
The existing phone number entries are automatically extended by the new "Subscriber number" input field when updating to v. 13.20. Make sure that the automatic allocation is correct and adjust the corresponding entries manually if required.
 
To edit a trunk group
1 In the menu, select Connections | Trunks.
2 A list appears with all Trunks.
Label
Explanation
Name
Trunk name
Type
Type of Trunk
Number of concurrent calls
Number of calls which may be routed via this Trunk at the same time
Activated
= The trunk is activated and can be used for incoming and outgoing calls.
= The trunk is locked, e.g. for maintenance.
Logged in
= Trunk is logged in
3 In the row of the desired trunks, click .
*The following tab appears General.
4 You can change the name, description, computer name, see Create trunks. You can also specify other settings:
* 
Whether a trunk has been enabled or disabled is not recorded in the change log.
 
Label
Explanation
Trunk is activated
Check the box to unlock the trunk for incoming and outgoing calls.
5 Click on Save.
6 Select the tab SIP registration (SwyxLink, SIP, SIP Gateway type only).
You can change the SIP registration data, see 8 Create trunks
7 Click on Save.
8 Select the tab Phone numbers.
*The list of all call number ranges assigned to this trunk appears.
You can edit or delete the corresponding phone number ranges.
9 If necessary, click Add phone number range to assign additional phone numbers or phone number ranges to this trunk, see also 15 Numbers and Number Mappings.
10 Click on Save.
11 Select the tab Codecs.
12 You can change the codec priority and filters, see Create trunks. You can also specify other settings:
Label
Explanation
Behavior during fax transmission
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 option "Use server standard setting" is activated as default in a new installation of SwyxWare, or in an update. The selection of the Codec filters, as of the options of the area "Action on fax receipt", is accordingly deactivated. The options cannot be selected.
 
13 Click on Save.
14 Select the tab Channels.
You can change the total number of simultaneous calls or set the number for each incoming and outgoing call.
15 Click on Save.
16 Select the tab Call number signaling:
* 
In Germany, the destination numbers 110 and 112 are reserved for emergency calls. The outgoing call number to these destination numbers is always signaled.
 
Label
Explanation
Always suppress number
Select whether and how the phone number for outgoing calls should be signaled via this trunk.
 
Select this option if the called party is not to be signaled (XXX), regardless of the phone number configured for this trunk.
Always Use This Number:
Enter a call number in canonical format or a SIP URI that is always signaled to the called party (e.g., the number of the central office), regardless of the call number configured for this trunk.
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
Specify which phone number this trunk uses. You can define the behavior for phone numbers that are assigned to this trunk as well as for phone numbers that have not been assigned, see the table:
Use
When assigned to this trunk
If assigned to this trunk, otherwise:
Required input
Origination Number
Number of the transferor
 
 
 
Hide number
 
 
 
Don't use this trunk
 
 
 
Use the following number
 
Enter the desired phone number
Number of the transferor
Origination Number
Hide number
 
 
 
Don't use this trunk
 
 
 
Use the following number
Enter the desired phone number
 
Hide number
 
 
* 
For Number Signalling via a SIP trunk, the provider must support the feature "ClipNoScreening". For further information see
Support of the feature ClipNoScreening on SIP trunks
https://service.swyx.net/hc/en-gb/articles/360000011599-Support-of-feature-ClipNoScreening-for-SIP-trunks-
 
17 Click on Save.
18 Select the tab Encryption (SIP Gateway, ENUM type only).
* 
If "No encryption" was set within the server properties, the mode here is also set to "No encryption"; if "Encryption mandatory" was configured, the setting "Encryption mandatory" can also be found here. In both cases, the mode cannot be changed. The field is then deactivated.
 
Label
Explanation
Encryption mode
No encryption
If "No encryption" is selected, the voice data going via this trunk is not encrypted. If the encryption mode was set to "No encryption" within the server properties, the mode is likewise set to "No encryption" here, and cannot be changed. The user is deactivated.
 
Encryption preferred
When "Encryption preferred" is selected, the voice data is only encrypted if the opposite terminal likewise supports encryption. If this is not the case, the voice data is not encrypted, but phoning is still possible.
 
Encryption mandatory
When "Encryption mandatory" is selected, voice data encryption is obligatory. This means that either encryption always occurs or the call is aborted with the reason "Incompatible encryption settings". This can be the case, for example, if the opposite terminal does not permit any encryption.
Key
To ensure secure communication by SRTP between SwyxServer and the opposite terminal, a common key (PreSharedKey) must be defined and exchanged between them.
For all components that use the SwyxWare database (e.g. SwyxIt!, PhoneMgr, ConferenceMgr, Gateway), this key is automatically generated by SwyxServer and distributed to the respective component in encrypted form.
For SIP gateway, ENUM type, the key must be entered manually. In addition, the stored key must also be entered at the remote terminal.
Repeat key
19 Click on Save.
20 Select the tab SIP URIs (SIP type only).
*The list of all SIP URIs assigned to this trunk appears.
21 You can edit or delete the corresponding SIP URIs.
22 If necessary, click Add SIP URI to assign additional SIP URIs to this trunk.
23 Select the tab Link settings (SwyxLink type only).
You can change the link settings for the SwyxLink trunk, see 8 Create trunks
24 Click on Save.
*The trunk settings have been updated.