【日本語・ビジネスマナー】全部正直に言いすぎなくてよい

[Shouldn't be too honest to tell everything on the phone]

会社にかかってくる電話、3コール以内にとりましょう。

Basically, in Japanese company, we have to pick up phone calls within 3 ringings.

他の人がいない時に、代わりにとってあげることもありますね。

そんな時でも理由をすべて相手に言って言いわけではありません。

We sometimes need to pick up instead of another workmate.

Even so, it's not right to tell every detail situation happening in our company to other people.

「ただいま席を外しております。」で十分です。

Just saying " He/She is away from her desk right now..." would be totally fine.

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しばらく帰ってこないことを意味したければ

if you want to imply "he/she won't come back for a while",

「打ち合わせに入っておりまして…」と

Just say "He/She is in the meeting at the moment. (Can he call you back?)"

具体的に説明しないことです。 Pls do not explain every details more than necessary for office manner.