Hi Aniket,
If you check "
Table 1 Summary of Supported Services for Expressway for Mobile and Remote Access
" of the following link
http://www.cisco.com/c/en/us/td/docs/voice_ip_comm/jabber/11_8/cjab_b_planning-guide-jabber-118/cjab_b_planning-guide-jabber-118_chapter_010.html
The last three rows show that what you are experiencing is default behavior
High Availability (failover) |
Audio and Video services
|
|
X
|
Voicemail services
|
|
X
|
IM and Presence services
|
X
|
|