Glossary

E1 – a digital trunk for phone lines

E1 is a digital line over which a carrier delivers up to 30 simultaneous phone calls to an office. It's an old but reliable technology: many companies still get their numbers over E1, though SIP trunking over the internet is gradually replacing it. E1 is the European standard; its North American counterpart is T1, with 24 voice channels.

Why it mattersIf your numbers come in over E1, you can connect them to the contact center without switching carriers.

Also called: E1 line, E1 trunk, PCM-30

How it works

An E1 line has 32 channels of 64 kbps each: 30 for calls and 2 for signaling and sync. The carrier brings the line into the office, and it connects to the PBX through a dedicated card or gateway.

In CONTACT.WORK

How it works in CONTACT.WORK

The platform accepts carrier lines not only over SIP but also over E1 or through GSM gateways, so you can keep your existing numbers.

Where to use it

Telephony Connect your own lines and numbers Learn more

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