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Community Member

Low Audio Volume When Transferring or Conferencing

I have a NEC 2400 PBX connecting to a Cisco 3825 via PRI Interfaces. The Cisco Router is running IOS 3825-advipservicesk9-mz.124-13b.bin. The router is acting as my VoIP Router. Inbound and Outbound call Quality is working perfect. If a digital phone connected to my PBX  either transfers or conferences a external phone, the voice audio drops. I increased my DB Level on my PBX PRI's. Can I perform the same function on my Cisco Controller Interfaces?

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Re: Low Audio Volume When Transferring or Conferencing

Hello Paul,

please post this under IP telephony forum.

Some of VOIP experts visit also this forum but most of these issues are handled there

Hope to help


Community Member

Re: Low Audio Volume When Transferring or Conferencing

I am using a default configuration on my voice-port. Since my PBX is connected to a Cisco Router via a PRI, would I need to modify the "input gain" or "output attenutation" ? For inbound and outbound calls voice quality is great, and I hear no echo, I am just having this issue with a conference or transfer out of the PBX.

ISDN 0/0/0:23 Slot is 0, Subslot is 0, Sub-unit is 0, Port is 23
Type of VoicePort is ISDN-VOICE
Operation State is DORMANT
Administrative State is UP
The Last Interface Down Failure Cause is Administrative Shutdown
Description is not set
Noise Regeneration is enabled
Non Linear Processing is disabled
Non Linear Mute is disabled
Non Linear Threshold is -21 dB
Music On Hold Threshold is Set to -38 dBm
In Gain is Set to 0 dB
Out Attenuation is Set to 0 dB
Echo Cancellation is enabled
Echo Cancellation NLP mute is disabled
Echo Cancellation NLP threshold is -21 dB
Echo Cancel Coverage is set to 64 ms
Echo Cancel worst case ERL is set to 6 dB
Playout-delay Mode is set to adaptive
Playout-delay Nominal is set to 15 ms
Playout-delay Maximum is set to 120 ms
Playout-delay Minimum mode is set to low, value 10 ms
Playout-delay Fax is set to 300 ms
Connection Mode is normal
Connection Number is not set
Initial Time Out is set to 10 s
Interdigit Time Out is set to 10 s
Call Disconnect Time Out is set to 60 s
Ringing Time Out is set to 180 s
Wait Release Time Out is set to 30 s
Companding Type is u-law
Region Tone is set for US
Station name None, Station number None
Translation profile (Incoming):
Translation profile (Outgoing):

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