This solution takes you through the process of creating a standard ('SIP Trunk') SIP account / trunk.

1 Once logged into the portal, go to the desired client account, select the 'SIP Accounts' tab and then select 'Trunks'.



2 Press the 'Add Trunk' button and a window will appear requiring details for your new trunk.

3 (a) Select an available unassigned number from the drop down menu as your 'Main Trunk Number'. The main number can be a 'spoofed' number if required but inbound calls will only be possible once a provisioned (or ported) number is assigned to the trunk.

Please note: You will be unable to create a trunk if there are no unassigned numbers available: that is, a number that is not already assigned to a trunk. To make a number available/unassigned, you would first need to release an unused trunk from an existing number or purchase a new number from the 'Numbers' tab. For more information on purchasing numbers, please refer to the solution 'Self Provisioning Numbers'

3 (b) Select a trunk type: either 'Standard' (charged to you per channel) or 'Bundled' (charged at a flat rate of 20 channels)      

3 (c) Channels: If the 'Standard trunk' option was selected in the previous step, you will be required to specify the amount of concurrent call channels / simultaneous calls you desire for this trunk. 

3 (d) Name your trunk: this will just serve as a simple, easy to reference ID for your trunk.


3 (e) CLI Number Format: This is how the main 'Main Number (SIP ID)' format will be presented from the PBX to our SIP Trunk Service for registration purposes.  Select either by 'National' to present the SIP ID format to us in standard national format, or 'International' format to present the SIP ID with leading '0044'.  This feature has been developed to recognise that some PBX's require the main SIP ID to be in this format.  This feature does not affect any call-based parameters and numbers from a PBX in 'any valid format' - be in standard national, or with leading '0044' or '+44' formats - will still be processed and routed.

NOTEIf a trunk is originally created with a ‘CLI Number Format’ of 'International' then the password hash algorithms, used behind the scenes in our password generation and authentication functionality, generates a password based in part on the ‘SIP ID’ in the international format of ‘0044...’.  If the ‘CLI Number Format’ is then changed to 'National' the password in essence becomes outmoded / incorrect, because it is still based on the international format instead of national format now used.  Therefore, please ensure that you change / reset the trunk password after you change the 'CLI Number Format', either from international to national, or vice versa.  You will be prompted to do this in any case:

3 (f) Registration: Registering your trunk using 'authentication based', that is (i) realm / SIP domain, (ii) username / SIP ID and (iii) password.  note that the realm / SIP domain will be as stated in your reseller 'Options' page and is re-stated on this dialog for convenience.  This is one of two ways you can register your trunk and is our recommended and default option.      



3 (g) IP Authentication: This is the second way a trunk can be registered is via IP address. If this is the chosen method, you will be required to enter the IP address in the resulting field. The SIP port is used together with 'IP Authentication'. This option allows authorization only through a particular SIP port. The typical setting is '5060' but this can be amended if need be.


3 (h) Transport: Currently, this field needs to be set at 'UDP' in order for the trunk to work effectively. There are future possibilities for improvements/features regarding this field.

3 (i)  Check Destination Prefix: This option enables/disables the 'Destination prefix' field which, if enabled, limits the trunk to only allow calls if the number presented from the PBX to the SIP trunking service starts with the desired prefix that is entered into the 'Destination prefix' field.  This setting can be regarded as a security feature.


3 (j) Fix Contact: For SIP provider internal use only.

3 (k) Disable RTP Auto Adjust: For SIP provider internal use only.

3 (l)  Call Limit Type: This allows us to calculate number of used trunk channels i.e. Total, Inbound, and Outbound. This is not connected with consumption.

3 (m)  Call Recording: If enabled, records all calls associated with this trunk.

3 (n) Trunk profile: This assigns your trunk a 'limit profile', which is typically set to 'DEFAULT CLIENT PROFILE' by default. (For further information on 'Limit Profiles' refer to the link to our solutions area here: Limit Profiles & Fraud Mitigation.)

4 Once completed, press 'Save'. You will now see the newly created SIP Trunk listed under 'Trunks', showing that it is linked to the chosen number. An email containing the SIP Trunk’s authentication details will then automatically be issued to the email address specified under the 'Options' tab.



5 You can always at a later date customize/edit your trunk by right clicking on the trunk and selecting 'Edit Trunk'.