Nortel (previously Northern Telecom) manufactured telephones for business users from the 1980s to 2001, beginning with the Meridian series.
Nortel no longer exists.
Since 2001, phones with the Nortel brand are made by Aastra Technologies Limited of Concord, Ontario.
Nortel's previous phones include: Due to proprietary digital signalling, VoIP ATA cannot be used for VoIP Enable this Phone.
Portico TVA allows these phones to seamlessly integrate with softswitches .