Satelitte broadband advice

watty

Uncompressed codec (G711) works poorer than a compressed codec such a iLBC, G729 or speex UNLESS the ISP only does the VOIP over their own backhaul and has QOS management for VOIP. 3rd Party VOIP has none of this, so G729 will actually perform better. It is about 12kbps.

ISPs with "integrated" toll quality VOIP only send the VOIP on their own network and will automatically switch between low bitrate G.729 and G.711 depending on content (Voice or Fax/Modem).

Marlow wrote:

In regards to downloads and phone at the same time. VoIP uses max 80kbit/s nominal ethernet speed each direction, if you use an uncompressed codec, less if you use a compressed codec. This leaves you with 432 kbit for your download. If that is not enough, you can go for 1.5 mbit symmetric at 45 eur (50 eur if you include blueface), which means for nearly the same price as eircom you have now 1456 kbit for your download, while making a phonecall with uncompressed codec.

Obviously you would either want to manage your download or prioritise the VoIP.

The user can only prioritise VOIP on their own data. Not the contented Network. The real problem with Blueface or other 3rd party VOIP is not your own data, but the Internet from your own modem onward. Real "integrated" ISP/VOIP suppliers carry the VOIP with managed QOS (prioritised if you like) from the user Modem to their own PSTN interconnect. Thus it is near landline quality and will support 10 page faxing quite well.

You can do nothing as a user to prioritise 3rd party VOIP. Multipage faxing is likely to fail due to packet loss or jitter. Voice will only be GSM quality or worse and will suffer badly at times of congestion.


If you want reliable VOIP use an integrated service phone supplier. Otherwise use Skype.

Also SIP based VOIP is awkward with NAT, routers and firewalls. Again the advantage of an ISP with integral voice is that the ATA is built in usually on an ISP's private subnet and does not traverse a firewall or be publically accessible to VOIP spamming (only a diallied number works as the ISPs "hidden" IP for the ATA/SIP port is a private IP range and not routable outside their network.

It also means it is more secure than a landline (Google how to tap a a landline phone without going into the house) and does not have the evesdropping risks of 3rd party VOIP as it is only on the ISps Internal network.

Generally the 12kbps VOIP approx on my phone handset is not distinguishable from the service we used to have from eircom.

Free SIP softphones on PCs do not generally do G.729 as that codec is not free. The iLBC and speex codecs, while perhaps as good and free, (linphone on Windows or Linux) may not be supported by the VOIP provider. You have to buy a softphone program for SIP VOIP using G729 on PC. Most HW ATA boxes with a phone port *DO* have the option.

canine

Hi
I know this question may have been asked many times but Im afraid Im a simpleton ,Ive been reading about Freesat and Free to air and Free to view andI think Im looking for the following ,and hoping someone can point me in the right (cheap ) direction
A freesat Reciever capable of playing HD tv with a hard drive so I can record

jor el

So many things wrong. You're in the wrong forum, this is an ancient thread about satellite Internet access. Nothing to do with TV.