A call transfer may seem simple, but behind the scenes, multiple phone systems must coordinate how to pass an active call to another person or number. They do this through SIP messages, which different vendors may handle in their own ways. When systems don’t agree, calls can drop, callers may hear silence, or transfers may… Continue reading Why VoIP call transfers fail between phone systems
Call transfer issues can be difficult to diagnose because users rarely report a rejected SIP REFER. Instead, they simply say the call dropped when they tried to transfer it to a colleague. Behind the scenes, the transfer involves several systems that must coordinate the handoff. When something goes wrong, understanding how these systems interact makes… Continue reading Blind, attended, and broken: What happens when phone systems hand off a call
Transfer failures between phone systems usually come down to a handful of common issues. One system may not support the transfer method, SIP headers may get changed along the way, progress messages may not come through, or a firewall may block the signaling. Each issue leaves clues in the SIP logs, making it easier to… Continue reading When a transferred call drops: How to troubleshoot SIP interoperability issues
