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asked on 11/11/2010

Which VoIP codec to use on a slow connection

Hi Expert,
What codec would you recommend I use for a ADSL connection that has a fair amount of latency (approx. 200 ping to SIP server).

So far I have been having most success with gsm although I did experiment with g729 for a long time but was told this would only be good if I had less latency?

Thanks,
Martin

Voice Over IP IP Telephony Telecommunications

Last Comment

11/14/2010

11/11/2010

http://www.cisco.com/en/US/tech/tk652/tk698/technologies_tech_note09186a0080094ae2.shtml

http://www.cisco.com/en/US/tech/tk652/tk698/technologies_tech_note09186a0080094ae2.shtml

Check out the chart on the Bandwidth.

We use G729 between our sites here in the US and our Site in Europe

11/11/2010

Oops... the second link was supposed to be this one http://voip.about.com/od/voipbasics/a/voipcodecs.htm

11/11/2010

What type of phone system are you using it on? That makes a difference too

11/11/2010

ASKER

Phones are Snom / Cisco but we are now experimenting and having luck with much cheaper chinese models.

g729 has too much delay for us. We find ourselves talking at the time as the client a lot of the time. This does not really happen with gsm.

Does my question make sense?

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11/11/2010

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11/11/2010

ASKER

How about speex or iLBC would they be better for low bandwidth? (compared to gsm)

11/11/2010

You can give it a go. It's just trial and error i'm afraid as to what will best suit you.

11/14/2010

ASKER

Is there a service I can use to help me test? Or do I have to "phone a friend" ?

11/14/2010

You have to phone a friend. Phone home... Phone home. lol

Voice Over IP

Voice over IP (VoIP) is a methodology and group of technologies for the delivery of voice communications and multimedia sessions over Internet Protocol (IP) networks, such as the Internet. Other terms commonly associated with VoIP are IP telephony, Internet telephony, broadband telephony, and broadband phone service. The term specifically refers to the provisioning of communications services (voice, fax, SMS, voice-messaging) over the public Internet, rather than via the public switched telephone network (PSTN). Examples of the VoIP protocols are H.323, Media Gateway Control Protocol (MGCP), Session Initiation Protocol (SIP), H.248 (also known as Media Gateway Control (Megaco)), Real-time Transport Protocol (RTP), Real-time Transport Control Protocol (RTCP), Secure Real-time Transport Protocol (SRTP), Session Description Protocol (SDP), and Inter-Asterisk eXchange (IAX).

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