On 2014-04-08, Christophe <t...@stuxnet.org> wrote: > Hi Stuart, > > Le 08/04/2014 10:41, Stuart Henderson a écrit : >> On 2014-04-07, Christophe <t...@stuxnet.org> wrote: >>> The goal is to accept every SIP device from inside the LAN to register >>> to SIP provider without any "outbound proxy" configuration, and let >>> siproxd acting as a masquerading server. >> >> Do you really need it? Most user-facing SIP providers run SBCs to work >> around NAT problems (amongst other things) and either don't need, or >> work better without, SIP NAT helpers. >> > > As you say : most , but not all ... and we have to deal with :( . > > Cisco routers (2600 and 800 series) are able to handle this : only > public IP address are seen in SIP packets on external network interface, > without configuring anything in "internal SIP devices" (IPBX or phones). > > That's why I try to get a similar behavior using a transparent SIP proxy. > > Don't know if it's the best way to do, but from what I know of SIP > protocol and NAT issues, I found it was a nice solution to handle all > cases with minimum configuration (or reconfiguration) ;).
First diagnosis step with many ITSPs is to disable any such proxies...
