You cannot dial another number if there is no answer when you dial out by using a modem on a Windows 7-based computer

Symptoms

You try to dial out by using a modem on a computer that is running Windows 7. However, you cannot dial another number if there is no answer. Additionally, CPU usage for the Telephony API (TAPI) service increases to almost 100 percent of the system's resources.

Resolution

Hotfix information

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing the problem described in this article. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=supportNote The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.

Prerequisites

To apply this hotfix, you must be running Windows 7.

Registry information

To use the hotfix in this package, you do not have to make any changes to the registry.

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace a previously released hotfix.

File information

The global version of this hotfix installs files that have the attributes that are listed in the following tables. The dates and the times for these files are listed in Coordinated Universal Time (UTC). The dates and the times for these files on your local computer are displayed in your local time together with your current daylight saving time (DST) bias. Additionally, the dates and the times may change when you perform certain operations on the files.

Windows 7 file information notes

Important Windows 7 hotfixes and Windows Server 2008 R2 hotfixes are included in the same packages. However, hotfixes on the Hotfix Request page are listed under both operating systems. To request the hotfix package that applies to one or both operating systems, select the hotfix that is listed under "Windows 7/Windows Server 2008 R2" on the page. Always refer to the "Applies To" section in articles to determine the actual operating system that each hotfix applies to.

  • The MANIFEST files (.manifest) and the MUM files (.mum) that are installed for each environment are listed separately in the "Additional file information for Windows 7" section. MUM and MANIFEST files, and the associated security catalog (.cat) files, are extremely important to maintain the state of the updated components. The security catalog files, for which the attributes are not listed, are signed with a Microsoft digital signature.

For all supported x86-based versions of Windows 7

File name

File version

File size

Date

Time

Platform

Unimdmat.dll

6.1.7600.20797

59,392

10-Sep-2010

04:36

x86

Unimdm.tsp

6.1.7600.20797

281,088

10-Sep-2010

04:29

Not applicable

For all supported x64-based versions of Windows 7

File name

File version

File size

Date

Time

Platform

Unimdmat.dll

6.1.7600.20797

73,216

10-Sep-2010

05:36

x64

Unimdm.tsp

6.1.7600.20797

321,536

10-Sep-2010

05:28

Not applicable

Unimdmat.dll

6.1.7600.20797

59,392

10-Sep-2010

04:36

x86

Unimdm.tsp

6.1.7600.20797

281,088

10-Sep-2010

04:29

Not applicable

Status

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

More Information

For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:

824684 Description of the standard terminology that is used to describe Microsoft software updates

Additional file information

Additional file information for Windows 7

Additional files for all supported x86-based versions of Windows 7

File name

Update.mum

File version

Not applicable

File size

1,652

Date (UTC)

10-Sep-2010

Time (UTC)

08:04

Platform

Not applicable

File name

X86_07cac77d0f47183265b425d0244c8d10_31bf3856ad364e35_6.1.7600.20797_none_5062cf2434179b6b.manifest

File version

Not applicable

File size

708

Date (UTC)

10-Sep-2010

Time (UTC)

08:04

Platform

Not applicable

File name

X86_4b62488104dbea5c23a91c434df82dfd_31bf3856ad364e35_6.1.7600.20797_none_9ef02f76490b357b.manifest

File version

Not applicable

File size

705

Date (UTC)

10-Sep-2010

Time (UTC)

08:04

Platform

Not applicable

File name

X86_microsoft-windows-unimodem-core-atmini_31bf3856ad364e35_6.1.7600.20797_none_8a85da12c5a6e34c.manifest

File version

Not applicable

File size

2,867

Date (UTC)

10-Sep-2010

Time (UTC)

05:05

Platform

Not applicable

File name

X86_microsoft-windows-unimodem-core-tsp_31bf3856ad364e35_6.1.7600.20797_none_ae311b734a0e7de7.manifest

File version

Not applicable

File size

2,506

Date (UTC)

10-Sep-2010

Time (UTC)

05:10

Platform

Not applicable

Additional files for all supported x64-based versions of Windows 7

File name

Amd64_874679438ded2b4ee437cd7895bf84d0_31bf3856ad364e35_6.1.7600.20797_none_a9847188f870edc5.manifest

File version

Not applicable

File size

1,058

Date (UTC)

10-Sep-2010

Time (UTC)

08:04

Platform

Not applicable

File name

Amd64_e65bba0dc89fdc2211c263942c72f279_31bf3856ad364e35_6.1.7600.20797_none_0ff0a1b3070cce15.manifest

File version

Not applicable

File size

1,064

Date (UTC)

10-Sep-2010

Time (UTC)

08:04

Platform

Not applicable

File name

Amd64_microsoft-windows-unimodem-core-atmini_31bf3856ad364e35_6.1.7600.20797_none_e6a475967e045482.manifest

File version

Not applicable

File size

2,871

Date (UTC)

10-Sep-2010

Time (UTC)

06:12

Platform

Not applicable

File name

Amd64_microsoft-windows-unimodem-core-tsp_31bf3856ad364e35_6.1.7600.20797_none_0a4fb6f7026bef1d.manifest

File version

Not applicable

File size

2,510

Date (UTC)

10-Sep-2010

Time (UTC)

06:16

Platform

Not applicable

File name

Package_1_for_kb2302026~31bf3856ad364e35~amd64~~6.1.1.0.mum

File version

Not applicable

File size

2,977

Date (UTC)

10-Sep-2010

Time (UTC)

08:04

Platform

Not applicable

File name

Package_2_for_kb2302026~31bf3856ad364e35~amd64~~6.1.1.0.mum

File version

Not applicable

File size

2,944

Date (UTC)

10-Sep-2010

Time (UTC)

08:04

Platform

Not applicable

File name

Package_for_kb2302026_rtm~31bf3856ad364e35~amd64~~6.1.1.0.mum

File version

Not applicable

File size

1,939

Date (UTC)

10-Sep-2010

Time (UTC)

08:04

Platform

Not applicable

File name

Update.mum

File version

Not applicable

File size

1,662

Date (UTC)

10-Sep-2010

Time (UTC)

08:04

Platform

Not applicable

File name

X86_microsoft-windows-unimodem-core-atmini_31bf3856ad364e35_6.1.7600.20797_none_8a85da12c5a6e34c.manifest

File version

Not applicable

File size

2,867

Date (UTC)

10-Sep-2010

Time (UTC)

05:05

Platform

Not applicable

File name

X86_microsoft-windows-unimodem-core-tsp_31bf3856ad364e35_6.1.7600.20797_none_ae311b734a0e7de7.manifest

File version

Not applicable

File size

2,506

Date (UTC)

10-Sep-2010

Time (UTC)

05:10

Platform

Not applicable

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