301455
35
Zoom out
Zoom in
Previous page
1/325
Next page
Getting Started
Ensuring Voice Quality
Cisco Small Business SPA300 Series, SPA500 Series, and WIP310 IP Phone Administration Guide 34
1
Echo—Impedance mismatch between the telephone and the IP telephony
gateway phone port can lead to near-end echo. Cisco SPA IP phones have
a near-end echo canceller with at least 8 ms tail length to compensate for
impedance mismatch. Cisco SPA IP phones implement an echo suppressor
with CNG so that any residual echo is not noticeable.
Hardware noise—Certain levels of noise can be coupled into the
conversational audio signals because of the hardware design. The source
can be ambient noise or 60 Hz noise from the power adaptor. The Cisco
hardware design minimizes noise coupling.
End-to-end delay—End-to-end delay does not affect voice quality directly,
but is an important factor in determining whether IP phone subscribers can
interact normally in a conversation. A reasonable delay should be 50 to
100 ms. End-to-end delay larger than 300 ms is unacceptable to most
callers. Cisco SPA IP phones support end-to-end delays well within
acceptable thresholds.
Adjustable Audio Frames Per Packet—Allows you to set the number of
audio frames contained in one RTP packet. Packets can be adjusted to
contain from 110 audio frames. Increasing the number of frames
decreases the bandwidth utilized, but it also increases delay and can affect
voice quality.
SIP Publish Signaling Improvements
The Cisco SPA IP phones resend the SIP PUBLISH messages with the voice
quality report once per 5xx response with a valid Retry-After header.
A valid time value in seconds is a positive integer from 0 to 65536. A SIP message
with a Retry-After time value of 0 is treated as a 500 Server Internal Error
message. A time value less than 0 is ignored.
The following is a summary of the 5xx messages with Retry-After header that the
phone supports:
5xx SIP Response Description
500 Server Internal Error An unexpected server condition prevents the
fulfillment of request.
503 Service Unavailable The server is unavailable due to a temporary
overload or maintenance.
Downloaded from www.Manualslib.com manuals search engine
35


Need help? Post your question in this forum.

Forumrules


Report abuse

Libble takes abuse of its services very seriously. We're committed to dealing with such abuse according to the laws in your country of residence. When you submit a report, we'll investigate it and take the appropriate action. We'll get back to you only if we require additional details or have more information to share.

Product:

For example, Anti-Semitic content, racist content, or material that could result in a violent physical act.

For example, a credit card number, a personal identification number, or an unlisted home address. Note that email addresses and full names are not considered private information.

Forumrules

To achieve meaningful questions, we apply the following rules:

Register

Register getting emails for Cisco spa509g ip at:


You will receive an email to register for one or both of the options.


Get your user manual by e-mail

Enter your email address to receive the manual of Cisco spa509g ip in the language / languages: English as an attachment in your email.

The manual is 2,55 mb in size.

 

You will receive the manual in your email within minutes. If you have not received an email, then probably have entered the wrong email address or your mailbox is too full. In addition, it may be that your ISP may have a maximum size for emails to receive.

Others manual(s) of Cisco spa509g ip

Cisco spa509g ip Additional guide - Dutch - 19 pages


The manual is sent by email. Check your email

If you have not received an email with the manual within fifteen minutes, it may be that you have a entered a wrong email address or that your ISP has set a maximum size to receive email that is smaller than the size of the manual.

The email address you have provided is not correct.

Please check the email address and correct it.

Your question is posted on this page

Would you like to receive an email when new answers and questions are posted? Please enter your email address.



Info