Can't add contacts to SIP account

Binary package hint: empathy

I'm not able to add any contact to my SIP account. When I choose option Chat>Add contact, SIP account is greyed out. It's painful to enter numbers every time I want to call someone.

ProblemType: Bug
Architecture: i386
CheckboxSubmission: c5321a5ec36a16ea36ff62422cce70e9
CheckboxSystem: 2a6f54df59af338184485e85cbcf0d32
Date: Fri Mar 26 13:17:50 2010
DistroRelease: Ubuntu 10.04
ExecutablePath: /usr/bin/empathy
InstallationMedia: Ubuntu 10.04 "Lucid Lynx" - Beta i386 (20100318)
Package: empathy 2.29.93-0ubuntu2
ProcEnviron:
 SHELL=/bin/bash
 LANG=en_GB.utf8
ProcVersionSignature: Ubuntu 2.6.32-17.26-generic 2.6.32.10+drm33.1
SourcePackage: empathy
Uname: Linux 2.6.32-17-generic i686
XsessionErrors:
 (polkit-gnome-authentication-agent-1:1483): GLib-CRITICAL **: g_once_init_leave: assertion `initialization_value != 0' failed
 (Do:1488): Wnck-CRITICAL **: wnck_set_client_type got called multiple times.
 (gwibber-service:1649): libnotify-CRITICAL **: notify_notification_update: assertion `summary != NULL && *summary != '\0'' failed
 (gwibber-service:1649): libnotify-CRITICAL **: notify_notification_update: assertion `summary != NULL && *summary != '\0'' failed
 (gwibber-service:1649): libnotify-CRITICAL **: notify_notification_update: assertion `summary != NULL && *summary != '\0'' failed