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If your phone system uses pulse dialing rather than tone dialing, change the 

setting to pulse here. (Most phone systems are tone.)

 When Availability Detection is on, the DVR checks whether the phone 

line is in use which allows it to avoid disrupting a call in progress.

This setting is off by default. With Availability Detection turned off, if you have another 
modem call in progress (on your computer or other device), that call may be disrupted if the 
DVR attempts to call the TiVo service. If you have a standard dial tone, and Availability 
Detection is off, make sure Dial Tone Detection is on.

 This setting is on by default. If you leave it on, the DVR will check for a 

dial tone before it starts dialing. However, if you have a non-standard dial tone, or a stuttering 
dial tone (as some voice messaging systems have), the DVR will be unable to detect the dial 
tone and will not make its call. 

If you are experiencing “Failed, Line 

unavailable” errors, or if the DVR is 

not making phone connections, you may 

have a low-voltage phone system that the 

DVR cannot detect. In this case, it’s best to 

have Availability Detection off.

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With Dial Tone Detection and 

Availability Detection both turned 

off, if you happen to be talking on the 

phone when the DVR tries to connect you 

will hear the its modem dial.