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Cisco ATA 186 and Cisco ATA 188 Analog Telephone Adaptor Administrator’s Guide (SIP)
OL-3410-01
Chapter 4 Basic and Additional SIP Services
Additional SIP Services
Comfort Noise During Silence Period When Using G.711
When silence suppression is turned on in ITU G.711, the Cisco ATA calculates and transmits its noise
level to the far end to enable the remote endpoint to generate the appropriate amount of comfort noise.
This provides the remote user with a similar experience to that of a PSTN call and prevents silent gaps
when neither party is talking.
Related Parameter
AudioMode, page 5-20—Bit 0 disables/enables silence suppression.
Configurable Hook Flash Timing
This feature provides the ability to adjust the hook-flash timing to meet local requirements.
Related Parameter
SigTimer, page 5-32—Bits 26 and 27 are for configuring the minimum on-hook time required for a hook
flash event, and bits 28 through 31 are for configuring maximum on-hook time.
Configurable Mixing of Call Waiting Tone and Audio
This feature allows the call-waiting tone to be mixed with the audio in an active call. Therefore, the
call-waiting tone will sound without a pause in the audio.
Related Parameter
ConnectMode, page 5-28—Bit 24
Configurable On-hook delay
This feature is available only for the recipient (callee) of a call. If the callee picks up the phone and then
later hangs up to retrieve another call, the hang-up is not considered on-hook until the specified delay
expires.
Related Parameter
FeatureTimer, page 5-26—Bits 8 to 12
Debugging Diagnostics
You can use the following parameters to troubleshoot operation issues:
• NPrintf, page 5-36—Specify the IP address and port where debug information is sent.
• TraceFlags, page 5-36—Use to turn on specific trace features.