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Problem with DTMF on SIP gateway

We are running Call Manager 4.2. We have a 2851 with three PRI and a MTP for a SIP gateway. We are having problems with outbound callers using the SIP gateway connectiong to VRUs where digits are being missed.

We have been asked to change

mgcp dtmf-relay voip codec all mode out-of-band to mgcp dtmf-relay rtp-nte

in attempt to correct the issue.

Does anyone know how this will affect the PRIs, if any? Please let me know if you need more info.

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