| Solution # |
K15163588 |
| Title |
One-way audio is experienced when cRTP is configured |
| Core Issue |
Compressed Real-Time Protocol (cRTP) needs to operate on both ends of each WAN link. If it is not configured or operating properly at one end, one-way audio may result. The user at the end that does not have cRTP operating correctly will not hear the user at the other end. |
| Resolution |
To resolve this issue, perform these steps:
- Check that the ip rtp header-compression or frame-relay ip rtp header-compression command is configured correctly on both sides.
- Check the Cisco Bug Toolkit for cRTP bugs in the Cisco IOS® Software version you are using.
For more information about resolving one-way voice problems, refer to Troubleshooting One-Way Voice Issues. |
| Problem Type |
Call connection (Connection quality: One-way audio, no busy tone, dropped calls, etc.) |
| Call Connection |
One-way audio |
| When Problem Occurs |
Part of call |
| Call Topology and Direction |
IP network > IP network
PSTN/PBX/gateway > IP network > PSTN/PBX/gateway |
| Data Network Physical Characteristics |
Leased line (PPP)
Frame relay |
| Bandwidth Saving Technique |
Compressed RTP (cRTP) |
| Signaling Protocol |
VoIP |
| Direct URL |
http://www.ciscotaccc.com/voice/showcase?case=K15163588 |
