Two chief officers, including a board director, will depart embattled telco Optus amid the fallout from the company's failure to connect hundreds of calls for help.

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Optus announced on Thursday chief financial officer and board director Michael Venter and chief information officer Mark Potter would leave the company in March.

The Singaporean-owned telco has recently come under scrutiny after bungling the handling of emergency calls to triple zero.

A firewall update caused an outage, which prevented more than 600 calls from connecting in South A

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