![]() ![]() A SIP ALG router rewrites the REGISTER request so the proxy doesn't detect the NAT and doesn't mantain the keepalive (so incoming calls will be not possible). Many SIP proxies mantain the UDP keepalive by sending OPTIONS or NOTIFY messages to the UA, but they just do it when the UA has been detected as natted during the registration. Common routers just mantain the UDP "conntection" open for a while (30-60 seconds) so after that time the port forwarding is ended and incoming packets are discarded by the router. This REGISTER is modified by the ALG feature (if not the user wouldn't be reachable by the proxy since it indicated a private IP in REGISTER "Contact" header). Lack of incoming calls: When a UA is switched on it sends a REGISTER to the proxy in order to be localizable and receive incoming calls.The main problem is the poor implementation at SIP protocol level of most commercial routers and the fact that this technology is just useful for outgoing calls, but not for incoming calls: ![]() A NAT router with a built-in SIP ALG can re-write information within the SIP messages (SIP headers and SDP body) making signaling and audio traffic between the client behind NAT and the SIP endpoint possible. If the SIP proxy doesn't provide a server side NAT solution, then an ALG solution could have a place.Īn ALG understands the protocol used by the specific applications that it supports (in this case SIP) and does a protocol packet-inspection of traffic through it. In some scenarios some client side solutions are not valid, for example STUN with symmetrical NAT router. ALG works typically in the client LAN router or gateway. There are various solutions for SIP clients behind NAT, some of them in client side (STUN, TURN, ICE), others in server side (Proxy RTP as RtpProxy,MediaProxy). While ALG could help in solving NAT related problems, the fact is that many routers' ALG implementations are wrong and break SIP. Many of today's commercial routers implement SIP ALG (Application-level gateway), coming with this feature enabled by default. I don't know if this will work on macOs Big Sur, but you can try at your own risks! I don't see why it would not work, but we never know, so please back-up your mac before trying!Įdit: thanks to people in the comments, we know that liteicons doesn't work on Big Sure for the moment.Posted by, Last modified by Albert Diaz on 04:03 PM Once you've applied all your icons and performed a quick reboot, just to make sure they're all here (optional), and only if you've done step 3, please turn SIP back on! It's very important for your mac's safety!. ![]() To restore an icon by the original, just drag it out. Change your icon by simply drag and dropping you png/ico/icns.If you wish to skip this step, liteIcon will display a warning at startup but you will still be able to change all non system apps icons :) BE EXTRA CAREFUL, THIS IS WHERE YOU CAN MESS THINGS UP SINCE YOUR MAC WILL NOT BE SAFE UNTIL YOU ACTIVATE IT BACK. If you want to change your system icons, you will have to disable SIP (System Integrity Protection) which prevents any system modification. I found mine on DeviantArt (I use ClayOS 8 by Octaviotti and Glacier Icons) First, you will need to install LiteIcon, it's free and you need it if you want to change your icons (obviously haha).I also changed the way folders looks in finder, using the same method (only works without SIP). My app drawer and dock with modified app icons (even system ones)Īs you can see (even on the dock), I managed to change system apps icons So first of all, here is some of my macOS Catalina apps icons (notice in te folder that the activity monitor icon is changed too): Just as a disclaimer, I will not be responsible if anything goes wrong during your installation, so please read carefully and do some research with google if you are unsure about stuff. That's why I decided to write this little tutorial on how you can change your macOs icons easily (and even system ones). ![]() I noticed that a lot of people were scared by the upcoming Big Sur icons, and how "ugly" they were (not my personal opinion here!). ![]()
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