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Features include call blocking and call forwarding. Configure the SIP registrar. The SIP registrar gives users control of accepting or rejecting registrations. Call preservation is useful when a gateway and the other endpoint typically a Cisco Unified IP phone are collocated at the same site and call agent is remote and therefore more likely to experience connectivity failures. When a Cisco router platform is installed with a voice-capable Cisco IOS Software, appropriate features must be enabled on the platform to prevent potential toll fraud exploitation by unauthorized users. The main advantage of a B2BUA call agent is in call forwarding, because it forwards calls on behalf of the phone. In addition, it maintains a presence as call middleman in the call path.
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The messages are fairly easy to understand and the call flows are straightforward enough. In previous articles, I have shown how vendors like Avaya have implemented SIP solutions that make it more difficult to follow some call flows, but even they become manageable once you understand the basic piece parts and architectures. Still, there are aspects that can be a bit confusing. This is even true for someone like me who has worked with SIP since the late s. They sort-of, kind-of get it, but are still unsure as to what they actually get.
When the user puts the call on hold, the user is able to resume the conversation by clicking the pause button. However when the user resumes the call both the caller and the user hear no sound, it is like the call is still on hold. The client looks like it is resuming the call.