I want to build a landline telephone using Arduino which can be connected to telephone lines to make & receive the calls
Good for you.
How does a touch tone help you in receiving messages?
Have you tried searching both the forum and the internet for how to do this. It has been done many times before.
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you could explore the use of a HT9200B as a DTMF generator
LOL. It doesn't. But
maybe since
it is to enter the telephone number of the person being called when calls are made.
@delysid the tone generator IC @J-M-L points to is easy to use.
Since you are using an Arduino, you could instead calculate and output the DTMF signals using software. The Arduino is plenty fast enough to synthesize the signals on the fly; it's actually kinda fun to get that working.
You'll need to do some research on the subtleties and dangers of working with a real land line. Plain old telephones have some circuitry that is truly marvelous. After solving all the issues that arise, you may find yourself leaving very little else to the Arduino than the synthesis of the DTMF tones, even that you might just hijack.
To avoid using any words or terms differently to how others might, risking offending them in some way, I simply refer you, for a start, to this article
A perfectly plausible pointless project, go for it.
One day I think this will be remembered in the context of David Cassidy's last words
So much wasted time.
a7
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Yes, yes it can. That's why the number one rule is to invite a friend over to do it.
a7
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What's the arduino going to do?
It's been literally 20+ years since I used one of these, but it should do 90% of what you need and is actually legal to connect to a POTS line: CH1840 Price & Stock | DigiPart
Come to think of it, I may have one in a drawer somewhere...
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I was holding tip and ring when someone called. Once.
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They don't call it "jingle juice" just because it makes the telephone ring.
I've tasted it, have to admit more than once...
a7
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Reading the documentation on the CH1840 brought back so many distant memories. (thanks @cedarlakeinstruments) I can't recall the last time I had to think about a REN. And, RJ11 from an approved manufacturer..! Great stuff!! 
I have a funny question...
If you hook up home-made stuff to, say, a Magicjack, who would find out or care?
It depends on the country you are in.
In the UK? No one.
That is because it is not designed for UK systems.
See:-
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That explains why I've not heard of it. To answer the question that wasn't asked: 'Who would notice or care if you plugged unauthorised equipment into any OK phone line, be it VoIP or traditional telephony, in the UK?' : No one.
Well it could be OpenReach if a fault was detected on the line and they had to come round and inspect it. This happened to me earlier this month when we got a fault on the line that my ISP could not detect. Turns out the house was wired with two master sockets many years back, and they had to fit a new style master and remove the duplicate.
The small print of our visit appointment mentioned having to pay a hefty fee if it proved to be something we had fitted.
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Ya' know, Mike, it works totally fine for me in Seoul. In spite of Korea's rather bizarre networking practices.
Just sayin'....
Does a great job of giving us the convenience of a NYC phone # here so we can talk to friends and relatives stateside on the cheep, also supports FAX (and does so better than Vonage or our old Cisco TAP), even supports rotary phones. Pretty suave.
Our uncle in Atlanta bought one for a relative down south in Jeolla so our aunts could jabber 7,200 miles apart for basically free. Works great. Configured it in the US, stuck it in the mail with a separate phone just for that, had a cousin down there plug it into their router. Only hitch was it being a challenge explaining to the aunt in Jeolla that she shouldn't be trying to dial with international prefixes on that phone.
But my real point is that VoIP totally redefines the picture of a PSTN, local loop, etc.
Ignoring the international regulatory differences - I'm sure most countries have stuff similar to if not carbon copied from what's in the US CFR - I haven't done a deep dive yet but the laws and regulations always seem to lag behind the tech. And a quick read tells me that VoIP seems to renders at least some of it irrelevant.
Of course if folks do choose to connect home-made stuff to VoIP gadgets they're still gonna need to make sure it acts like a phone (or is sufficiently passive) else it ain't gonna work... 
But for some that too can be a learning experience.
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You have got to marvel at the total insularity that it seems most Americans appear to show. You are not alone in this.
I'm living on two continents and have personal involvement in things like motor vehicle regulation in international markets. I've had opportunities to see how legislation, rulemaking, homologation, etc. works, domestically and abroad. Most folks never have that opportunity. And yeah, American media doesn't pay much attention to what's going on beyond their borders so it shouldn't be a shocker when the consumers of that media suffer similar myopia.
I do in fact marvel at how the US meddles in international homologation standards, for example, then opts out of them. 
From a regulatory standpoint the nicest thing to be said is that it makes little sense to reinvent the wheel. Especially when that wheel may find itself rolling upon distant roads.
No matter who copies from whom, the copying is as inevitable as death and taxes.
And it really really REALLY needs to be said, as everyone moves forward, that little good ever tends to come from not-invented-here-syndrome.
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