This is sent out from your end (the originator).
The Confirmation Stage: This is the final acknowledgment of the call connection. This part of the process also initiates at the receiving party. The Answering Stage: The answering stage is an acknowledgment of the inbound call, not the call itself. The Invite Response Stage: When the connection happens, a response is sent back to the initial dialer. The Invite Stage: This happens when you reach out to another caller to initiate a call. SIP helps open and terminate data connections, but with a SIP call, there are a few steps in between. To understand why SIP ALG is so problematic for modern SIP phone systems, take a look at the five-step process involved when you’re trying to make a SIP call. This is why many SIP trunking providers tell you to disable the feature on your router. Unfortunately, the technology often ends up hindering the quality of SIP calls due to the multi-process nature of SIP and the delicateness of data packets. Remember, all VoIP changes audio data (voice) into packets that are then sent over the net, so theoretically, this should ensure call quality. It inspects the SDP portion of data packets and modifies them so that they send correctly. The SIP ALG acts as an independent firmware program to prevent firewall-related issues on the router. The ALG is a network address translation (NAT) tool that changes private IP addresses and ports into public IP addresses and ports. This technology, which is also called an application-level gateway, is available on most commercial routers, and it helps users more reliably initiate SIP calls, even when behind a LAN with a secure firewall configuration. 
SIP ALG is the session initiation protocol application layer gateway.
Still, you need call audio quality and one of the first steps that you’ll need to take to ensure this is to disable SIP ALG on your router. In fact, adopters of VoIP technology save as much as $5,000 a year by switching. SIP calling allows you to reach customers and colleagues around the world at a significantly lower cost as compared to other technologies. With it, you don’t need extensive hardware for outgoing and incoming calls everything is done using simple computers, SIP endpoints (SIP and VoIP phones and associated communications devices), and the internet. SIP is one of the cornerstones of business VoIP you need it to make calls since it creates and maintains connections to the other party.
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