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> No, SIP is a terrible protocol so things will often break unintentionally. I use Asterisk and I've never had random problems with SIP. All my problems have b

by nadams 11y ago

> No, SIP is a terrible protocol so things will often break unintentionally. I use Asterisk and I've never had random problems with SIP. All my problems have been due to network (such as firewalls or network disconnected) or client implementations. I've found this article which makes me laugh [1]: > The solution is remarkably easy! If it's so easy - why doesn't he create an RFC proposal for a SIP 2.0? SIP isn't the only protocol that isn't flawless. FTP and VPN comes to mind. But here is an article that states exactly what I said and experienced [2]: > SIP works fine in either an IPv4-only or IPv6-only environment, but issues arise in a mixed environment. [1] http://www.talkingpointz.com/why-sip-sucks http://www.talkingpointz.com/why-sip-sucks [2] http://www.networkcomputing.com/networking/can-sip-and-ipv6-co-exist/d/d-id/1233831 http://www.networkcomputing.com/networking/can-sip-and-ipv6-...?

MichaelGG 11y ago
Yes, FTP has an atrociously bad design. The difference is that SIP wasn't made in the early 80s, so what's their excuse? VPNs typically do OK, except IPSec because the IETF didn't want to admit that NAT existed (though I believe they cleaned that up with an add-on and things are mostly fine now.) As an end-user, hopefully your implementors have solved most problems for ya. As an implementor, SIP is a curse. (HTTP, which SIP drew its nutty parsing rules from, recently ditched the entire format in preference of a binary format. Not related to the IP-embedding-galore that SIP added, but still interesting to note.) SIP does not "work fine" in an IPv4 only environment, as any NAT user will attest to. It can, by ignoring the RFC and hoping that no middleware gets involved. (Middleware only gets involved because the RFC makes it a juicy target.)
- nadams 11y ago
  > VPNs typically do OK Assuming the network administrator has configured his router for VPN pass through [1]. > SIP does not "work fine" in an IPv4 only environment, as any NAT user will attest to. Seems to work fine for me. The built in SIP client for Android works great in IPv4 both NAT and non-NAT. However, it seems to have some issues with IPv6 (not surprised due to the lack of feedback on the Android bug tracker...). Zoiper on the other hand will work through pretty much anything you throw at it. I'm not saying SIP is perfect - but my experiences with SIP have been generally positive with Asterisk. Now I'm also in control of Asterisk and can tweak the configuration - I'm sure a lot of canned SIP systems are completely broken. [1] http://www.tp-link.us/FAQ-558.html http://www.tp-link.us/FAQ-558.html

by nadams 11y ago

MichaelGG 11y ago

Yes, FTP has an atrociously bad design. The difference is that SIP wasn't made in the early 80s, so what's their excuse? VPNs typically do OK, except IPSec because the IETF didn't want to admit that NAT existed (though I believe they cleaned that up with an add-on and things are mostly fine now.) As an end-user, hopefully your implementors have solved most problems for ya. As an implementor, SIP is a curse. (HTTP, which SIP drew its nutty parsing rules from, recently ditched the entire format in preference of a binary format. Not related to the IP-embedding-galore that SIP added, but still interesting to note.) SIP does not "work fine" in an IPv4 only environment, as any NAT user will attest to. It can, by ignoring the RFC and hoping that no middleware gets involved. (Middleware only gets involved because the RFC makes it a juicy target.)

nadams 11y ago
> VPNs typically do OK Assuming the network administrator has configured his router for VPN pass through [1]. > SIP does not "work fine" in an IPv4 only environment, as any NAT user will attest to. Seems to work fine for me. The built in SIP client for Android works great in IPv4 both NAT and non-NAT. However, it seems to have some issues with IPv6 (not surprised due to the lack of feedback on the Android bug tracker...). Zoiper on the other hand will work through pretty much anything you throw at it. I'm not saying SIP is perfect - but my experiences with SIP have been generally positive with Asterisk. Now I'm also in control of Asterisk and can tweak the configuration - I'm sure a lot of canned SIP systems are completely broken. [1] http://www.tp-link.us/FAQ-558.html http://www.tp-link.us/FAQ-558.html