---

---

Delays
low data rate
QOS wasn't good
codecs available G.711,G.728,G.729 & G.729a etc.

---

Posted by Hash007

VOIP depends on Internet connection. If internet are down or you may not make calls. So VOIP totally depends on VOIP connection.

---

Posted by meenakshi123

1.)It didnt provides good quality of service that customers are accustomed to with regular telephone technology. The reason for this is multifold.

2.)VOIP requires a large amount of data to be compressed and transmitted, then uncompressed and delivered, all in a relatively small amount of time.Problems develop in VOIP conversations when this process takes too long and the callers experience one of two problems; echo or over-talk.

3.)One major disadvantage of VOIP is that there have been delays of up to 400 milliseconds, meaning that the callers won't hear each other fast enough to make the conversation flow easily. They will either hear themselves talking or they will start talking again before they have heard the other person respond.

4.)During a blackout a regular phone is kept in service by the current supplied through the phone line. This is not possible with Internet phones, so when the power goes out, there is no VoIP phone service. One solution to this problem is to use battery backups or power generators to provide electricity.

---

Posted by sagitraz