codec of sip settings

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codec of sip settings

Postby wycito » 06/04/2009

Hi guys I recently bought the sip settings and the quality of the codec used there is a lot of hiss in the background, and sometimes the call I can not hear well the person, is not my internet connection, I have 7.5 Mbits down and 1Mbit up, I have used other voip services with no Issues whatsoever, Pls check into it, I know the service is still young but I cant have a phone line in my home that 3 out of 10 calls the quality of the voice is that low
thanks
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Re: codec of sip settings

Postby amitmeh » 06/05/2009

1) check your QoS settings on the router! Make sure to prioritize port 6060, 13000, and 13001. It will fix the problem.

2) Use codec g729a. If you use a linksys router make sure to check 'yes' for using preferred codec only.
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Re: codec of sip settings

Postby Krazie243 » 06/10/2009

The following are the settings you need to make your adaptor work: (Things in italics are sometimes optional)

ATA:
Codec = G729a
RTP Packet Size = 0.020
Register Expires = 180
Ring Voltage = 90
Ring Frequency = 52


Router:
For ATAs - UDP 5060 (line 1) and UDP 5061 (line 2) must be open
For Softphone - UDP 13000 and UDP 13001 must be open

Things to note: If your adaptor has incorrect time settings (as is frequently the case in newly purchased Linksys PAP2T-NA devices) you will need to update these settings. The settings we use are:
(Under Regional) Time Zone = "start=3/8/7/2:00;end11/1/7/2:00;save=1"
(Under Regional) Time Offset = "GMT -5:00"
(Under System) Primary NTP Server = "time.nist.gov"
(Under System) Secondary NTP Server = "time.windows.com"

All other SIP detail require the purchase of a configuration file for $50 via credit card when you call an agent.
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