GSM/3G/4G Trunk Settings

When you configure a GSM/3G/4G trunk, you may need to configure some of the advanced settings. This reference describes all the settings on a GSM/3G/4G trunk.

Basic settings

Navigation path: Settings > PBX > Trunks, edit a trunk on the Basic tab.


Settings	Description
Name	Give this trunk a name to help you identify it.
PIN Code	Enter the SIM card PIN code if the card has one. Note: If you fail to enter your correct PIN code 3 times in succession, the SIM card will be permanently locked, which means you will need a new SIM card.
RX Volume	Set the receiving volume of GSM port or choose "Custom" to define the RX Gain below.
TX Volume	Set the transmitting volume of GSM port or choose 'Custom'' to define the TX Gain below.
Echo Cancellation	Enable or disable echo cancellation.
DNIS DNIS Name	DNIS (Dialed Number Identification Service) is a telephone service that identifies for the receiver of a call the number that the caller dialed. If you want to use the feature, enable it and fill in the DNIS name.
DID Number	If you wish the inbound call through this trunk to be redirected via outbound route, please fill in the destination number to be called.
Enable SLA	After enabling SLA, users can share this trunk to make outbound calls and receive inbound calls by BLF keys on their phones. Note: If SLA is enabled, Inbound Route settings and Outbound Route settings for this trunk is invalid.

Advanced Settings (4G)

Navigation path: Settings > PBX > Trunks, edit a trunk on the Advanced tab.

Note: Yeastar S-Series VoIP PBX V4.0 only supports the Carrier setting.


Settings	Description
Carrier	Choose the carrier: Automatic: the system will select a carrier automatically. Manual: choose a carrier from the available carrier that the system provided.
Mode	Select trunk mode: Voice and Data: can be used for both voice call and data access. Voice Only: can be used only for voice call. If you need to access the Internet via 4G network, please install the 4G LTE module on the designated module slot of the corresponding PBX models. (S412 Lite: Slot_3; S412: Slot_3; S20/S50: Slot_1; S100/S300: Slot_1. Expansion Card_1.)
Network Type	Select the network type: Automatic: system will select a suitable network type for you. LTE Only: use only 4G network. By selecting this option, you can enable VoLTE for HD voice; WCDMA Only: use only 3G network; GSM Only: use only 2G network;
VoLTE	The change of this option requires the device to be rebooted. Before enabling this option, make sure VoLTE is supported by your carrier and has been activated.

Adapt Caller ID

The incoming caller ID that matches the adaptation pattern will be adapted, so that you can press the call record directly on your phone call back a number.

For more information, see Change Inbound Caller ID.

Navigation path: Settings > PBX > Trunks, edit a trunk on the Adapt Caller ID tab.


Settings	Description
Patterns	The following characters have special meanings: X matches the numbers 0- 9; Z matches the numbers 1-9; N matches the numbers 2- 9; [12345-9] matches the numbers in the bracket (in this example, 1, 2, 3, 4,5, 6, 7, 8, 9); Wildcard matches one or more numbers. E.g. "9011." matches anything starting with 9011 (excluding 9011 itself); Wildcard "!" matches none or more than one numbers. E.g. "9011T matches anything starting with 9011 (including 9011 itself);
Strip	Strip allows you to specify the number of digits that will be stripped from the front of the Caller ID before the call is displayed. For example, if the incoming Caller ID is 05929999999, but you need to dial number 5929999999 to call back, one digit should be stripped.
Prepend	These digits will be prepended to the Caller ID before the call is displayed. For example, if the incoming caller ID is 5929999999, but you need to dial digit 0 before the number to call back, 0 should be prepended.