One SIP Trunking channel is needed for each call. So it depends on how many channels you have for your business. Your business can handle as many SIP Trunking calls as you have channels. For example, if your business requires five active calls at the same time then you need to have at least five channels. So according to this example, the sixth person to call on your number will hear a busy signal. So in a nutshell:
1 trunk channel = 1 inbound/outbound call
Once any of the busy channels and their call is free then the next outbound call can be successful.
MachCloud offers a platform to cater all your SIP Trunking and Cloud Telephony needs. With MachCloud, the migrations and onboarding are made easy and hassle-free. You can get unlimited trunk channels and competitive calling rates.
Get in touch with a MachCloud expert to get help and support for SIP Trunking.