I saw ただいま at the beginning of two expressions and I couldn't understand its
meaning in the context.

> A : すみません。かいがいじぎょうかのぱくさん、おねがいしたいんですが。
>
> 受付：おやくそくですか。
>
> A : はい。
>
> 受付：ただいまおよびします。しょうしょうおまちください。  
>  もうしわけございません。ぱくはただいま電話中ですので、こちらでおまちください。

What do ただいまおよびします and ただいま電話中 mean?  
And is there a rule about ただいま in grammar?
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question
grammar
ただいま～ at the beginning
I shall explain each word as I am not sure of your level, or how much of the
sentence you understand.

> ただいまおよびします and ただいま電話中

およびします is a humble way to say よびます (polite) / よぶ (plain), to call (someone).
If you are unfamiliar with humble conjugations and keigo and you would like to
learn more, please visit [this
site](http://www.guidetojapanese.org/learn/grammar/honorific) (hard!).

電話中 means currently on a call (電話{でんわ} phone; phone call + 中{ちゅう} currently).

ただいま, other than a greeting meaning "I'm home!", can also mean "right now".
(See comment by Shoko below)

Putting it all together:

> ただいまおよびします
>
> _I will call ぱく right now._ (Edited)
>
> ただいま電話中
>
> _ぱく is currently on a call._

* * *

> and is there a rule about ただいま in grammar ?

In these cases, ただいま is used in the sense of "right now", as an adverb.
Adverbs often can be placed in many places in a sentence, but it is usually
immediately to the left of **the word it is describing** (currently
**calling** = ただいまおよびします; currently **on a call** ただいま **電話中** )
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answer
According to 明鏡国語辞典:

> ただいま【只今】  
>  〘副詞〙  
>  ❶〘名詞〙まさに今。今現在。「ただいま準備中」  
>  ❷〘名詞〙つい今しがた。「ただいまお帰りになりました」  
>  ❸すぐに。もうすぐ。「はい。ただいま参ります」

ただいま can mean:

>   1. "right now" "now at this moment" "currently". Often used with
> 「Verb+ています」「XX[中]{ちゅう}」「XX[中]{ちゅう}です」
>   2. "a moment ago" "just now". Often used with 「Verb+ました」「Verb+たところです」
>   3. "right away" "at once" "immediately". Often used with 「Verb+ます」
>

ただいま in ただいまお呼びします means 3. "right away" "at once" "immediately", and ただいま in
ただいま電話中です means 1. "right now" "now at this moment" "currently".

> ただいまお呼びします。I will call him _immediately_.  
>  ただいま電話中です。 He is on another line _at the moment_.

* * *

As a side not, ただいま used in these meanings is pronounced [ただいま]{LHLL}.  
ただいま as a greeting is pronounced [ただいま]{LHHH}.  
(Though it might depend on the region; in Kansai I often hear it pronounced as
[ただいま]{LHLH}.)
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answer