incoming is ok but outgoing is not working

[techguy]

One starnge problem, inbound calls are working but outbound calls from CUCM is not ok. PSTN Lines (FXO) are ok, as i have tested by analogue phone.

Following is the error.

QADHLNR0012901#sh voice iec description 1.1.278.5.88.0

    IEC Version: 1

    Entity: 1 (Gateway)

    Category: 278 (Media Negotiation Failure due to non-existing Codec)

    Subsystem: 5 (H323)

    Error: 88 (Fast codec mismatch)

    Diagnostic Code: 0

[acampbell · Accepted solution]

Hi,

Looks like you are failing due to H323 FastStart

On the CUCM page for the H323 gatway look at the OUTGOING CALLS section.

Have you selected "Enable Outbound Faststart" , have you selected the correct codec for Faststart.

You could just try unticking the Faststart and retest.

Regards,
Alex.
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