I'm new to VOIP. We are thinking of setting up a VOIP system between a couple remote offices. I've been lurking on this group for a while. What is the consensus on these phones: http://www.netvoice.ca/grandstream/budgetone101.htm I'm confused about the SIP protocol... can a SIP phone be located behind a NATing firewall ? When people use asterisk on a broadband connection used for data and VOIP, do they put the asterisk machine behind a firewall or do they put the firewall on the asterisk machine ? Is anyone using QOS throttling when sharing VOIP and data on the same broadband connection ? Is it necessary ? Thanks. -- Kim Lux (Mr.) Diesel Research Inc
Doug Lytle
2004-Dec-06 14:20 UTC
[Asterisk-Users] Budgetone 101 phones ? SIP through NAT ?
Kim Lux wrote:>I'm new to VOIP. We are thinking of setting up a VOIP system between a >couple remote offices. I've been lurking on this group for a while. > >What is the consensus on these phones: > >http://www.netvoice.ca/grandstream/budgetone101.htm > > >Cheap, but useable. I'd go for the 102 model though, since it has a 2nd ethernet port. It was listed as $124CA>I'm confused about the SIP protocol... can a SIP phone be located behind >a NATing firewall ? > >I'm currently testing 1 phone behind NAT. Works fine. The server is running in the office, linked between an OpenVPN connection (TAP) and NATted behind the TAP adapter's IP.>When people use asterisk on a broadband connection used for data and >VOIP, do they put the asterisk machine behind a firewall or do they put > >I'm playing around with 1 Asterisk box on my Mandrake Firewall, I've opened up 1 port to allow the firewall to contact the Office Asterisk server(Plan on trying to get inter-Asterisk boxes taking). In a production environment though, it should be running on a separate box behind the firewall.>Is anyone using QOS throttling when sharing VOIP and data on the same >broadband connection ? Is it necessary ? > > >I'm not yet. Doug
Miguel Ruiz Velasco Sobrino
2004-Dec-06 14:51 UTC
[Asterisk-Users] Budgetone 101 phones ? SIP through NAT ?
>I'm new to VOIP. We are thinking of setting up a VOIP system between a >couple remote offices. I've been lurking on this group for a while. > >What is the consensus on these phones: > >http://www.netvoice.ca/grandstream/budgetone101.htm > > >I'm confused about the SIP protocol... can a SIP phone be located behind >a NATing firewall ? >When people use asterisk on a broadband connection used for data and >VOIP, do they put the asterisk machine behind a firewall or do they put >the firewall on the asterisk machine ?You will have a rather big problem doing that, you will likely end in the one-way audio scenario; to overcome that you may use STUN or TURN or an application level gateway (example: *). STUN is rather complicated to configure and I advise that only if you REALLY need it; never used TURN, but is almost the same. Now, you can put a multihomed machine (with an IP and posibly a NIC in each side of de fw), to do the passing of the calls to an external provider. But if you will link different offices each one with an * server, use IAX2 in the middle, it doesn't suffer the on-way-audio-problem, it's NAT friendly (if you have one or many in the middle), and if you enable trunking, saves a good bunch of bandwidth for each additional conversation.>Is anyone using QOS throttling when sharing VOIP and data on the same >broadband connection ? Is it necessary ?I use QOS to prevent de data traffic eating all the available bandwidth and render VoIP unusable. You can use a HTB with SFQ in each bucket, or a pfifo, or if you are brave and know what are about to do, use diffserv.>Thanks.Miguel Ruiz Velasco ====Miguel Ruiz Velasco Version: OpenKeyServer v1.2 Comment: Extracted from belgium.keyserver.net Signature: 0x59831109 __________________________________ Do you Yahoo!? All your favorites on one personal page – Try My Yahoo! http://my.yahoo.com