Connection trouble

[ironmaiden187]

For context updated an old internal php site from 5.4 to 7.4 recently and needed a replacement for php_imap so I'm attempting to use this project. Was able to get connected to a gmail account no problem. However I also need to connect to an ancient Nortel BCM50 phone system with a voicemail that's setup as an imap mail server. So far using the old connection script that previously worked in 5.4 just throws the following error:

Warning: imap_open(): Couldn't open stream {10.0.1.130:143}INBOX in /var/www/html/bartec/batchops.php on line 13. Source code in /var/www/html/bartec/vendor/javanile/php-imap2/src/Connection.php on line 81
Cannot connect: Can not authenticate to IMAP server: A0002 BAD Argument given to AUTHENTICATE when none expected

Connection line was simply the following:
$imap_conn = imap_open("{10.0.1.130:143}INBOX", 'user', 'pw') or die('Cannot connect: ' . print_r(imap_last_error(), true));

I've tried quite a few different connection options and none seem to let me connect. If anyone has tips for getting connected to an ancient phone system or some connection options I might be missing would be much appreciated.

Also of note was able to connect via telnet using the ip/port and login was accepted via telnet from the server running php/webserver.