Quick Google search turned up https://support.webex.com/US/PT/wx_pt_ag.pdf which list all the silent install switches you need as well as information on how to install WebEx Productivity Tools via SMS.
msiexec.exe /i ptools.msi ALLUSERS=2 SITEURL="http://YOURSITE.YOURDOMAIN.COM" OC=1 OFFICE=1 IE=1 /l*v %WINDIR%\Temp\CISCOWebExProdTools2.8.0.501.401-Install.log /qn
The below command installs for all users and configures the site URL only:
msiexec.exe /i ptools.msi ALLUSERS=2 SITEURL="http://YOURSITE.YOURDOMAIN.COM" /l*v %WINDIR%\Temp\CISCOWebExProdTools2.8.0.501.401-Install.log /qn
Hope that helped someone :)
Coaxus.
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