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This document addresses a critical issue regarding the voice communication setup between the Siemens Hipath and ISDX systems over a Transparent CCS IP Link. Users experience a failure in audio transmission during call initiation—the ISDX end phone rings, but no speech or ringback tone is received on the Hipath end. Both PBXs are synchronized via TCCS, and all channels are operational and trunked. This guide aims to identify potential causes and provide troubleshooting steps to resolve the communication issue effectively.
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Voice over IP High Level Topology Ring Back issue ISDX CONV 33 Signal Siemens Hipath Transparent CCS IP Link Transparent CCS Cisco Voice Router Cisco Voice Router • Note: • Both PBX’s synchronized via TCCS • All the channels are up & trunked • A call is originated from Hipath • ISDX end phone is ringing & user goes off hook • No speech or ring back tone heard in the Hipath end