PPDG phone conferences can be accessed via the following numbers:
  Internal: 5008
     Local: (510) 486-5008
 Toll Free: 1-877-252-5250

Then press 1 and enter 7734# and follow the instructions.
 

International Access Telephone Numbers :

Country   Access 800 Number

Australia   0011 800-52522520
Belgium       00 800-52522520
China            10-800-120-0670   
Denmark       00 800-52522520
Finland          0-800-1-18927   
France        00 800-52522520
Greece            00800-12-5589   
Germany       00 800-52522520
Hong Kong        800-965870
Hungay           06-800-4690   
Israel       014 800-52522520
Italy            800-791781   
Japan
  NTT       0041 800-52522520
  KDD       0061 800-52522520
  IDC        001 800-52522520
Malaysia      00 800-52522520
Mexico           877-252-5250   
Netherlands      0800-0228503   
Singapore    001 800-52522520
Switzerland   00 800-52522520
Sweden        00 800-52522520
Taiwan           0080-13-7112   
Thailand     001 800-52522520
Turkey           00800-151-1087   
UK            00 800-52522520