AboutGerry Magill Expertise I am a Software Architect employed by a large multi-national communications company providing VoIP and tradtional TDM communications to Enterprise customers.
Experience
Past/Present clients IBM, SBS, Siemens, KPMG, Bank Berlin, Commerzbank
I want to ask if the telephone service is conection oriented or connectionless . And is it reliable or un reliable service and Why??
ANSWER: I dont think I fully understand your question and what it has to do with the subject title "What's ARP?".
Also, are you talking about VoIP telephone service or TDM or GSM or CDMA, or what type?
More info please.
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QUESTION: Sorry
The question was : Is the tlephene service connection oriened or connectionless and WHY?
Answer I already answered this question on 4/14:
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Questioner: lesamurai
Category: IP Telephony
Private: No View Published Answer
Subject: PSTN reliable or unreliable
Question: QUESTION: Hello ,
I want to ask if the telephone service is conection oriented or connectionless . And is it reliable or un reliable service and Why??
ANSWER: I dont think I fully understand your question and what it has to do with the subject title "What's ARP?".
Also, are you talking about VoIP telephone service or TDM or GSM or CDMA, or what type?
More info please.
---------- FOLLOW-UP ----------
QUESTION: what I want to know the public switched telephone system is reliable or unreliable.Connection oriented or connectionless. and Why?
About the name it was just a mistake
Answer: Tradtional PSTN carriers use connection oriented technology to inter-connect one telephone exchange with another. Typically this was T1 or some other time division multiplexing technology, which hand-shakes at the transport layer to ensure the other side is up and operational before sending traffic accross that link. If the link goes down, the carrier re-routes the traffic accross an alternate link, bypassing that node. This and the use of Intelligent Networks, made the backbone self-healing in many cases and provided a very robust and stable network.
Long haul carriers are now moving toward IP for interconnectivity. SIP is gaining traction and traditionally, this has been a UDP based connectionless protocol. If the partner node goes down, this can mean a re-transmission attempt of up to 30 seconds before re-routing takes place. However, SIP is now becoming more and more popular over TCP and TLS to ensure secure communications. These protocol are connection based and ensure transmission.
Typically, a PSTN node will have 99.999% reliability built in. To achieve this you have to have totally redundant hot swappable systems with virtually zero down-time.
However, not every country has the same technology. So depending on where you are referring to, outage times can vary widely but in general they are highly reliable.
