Hi Sachin,
Just to add a note to the good info from my friend Marwan.
SCCP: Configuring Call-Waiting Indicator Tone
To specify the type of audible call-waiting indicator on a SCCP phone, perform the following steps. The default is for directory numbers to accept call interruptions, such as call waiting, and to issue a beep tone. Instead of the standard call waiting beep, you can enable a ring tone for call-waiting.
Restrictions
•The call-waiting ring option is not supported if the ephone-dn is configured with the no call-waiting beep accept command.
•If you configure a button to have a silent ring, you will not hear a call-waiting beep or call-waiting ring regardless of whether the ephone-dn associated with the button is configured to generate a call-waiting beep or call-waiting ring.
•The call-waiting beep volume cannot be adjusted through Cisco Unified CME for the Cisco Unified IP Phone 7902G, Cisco Unified IP Phone 7905G, Cisco Unified IP Phone 7912G, Cisco ATA-186, and Cisco ATA-188.
•The call-waiting ring option is not supported on the Cisco Unified IP Phone 7902G, Cisco Unified IP Phone 7905G, or Cisco Unified IP Phone 7912G.
SUMMARY STEPS
1. enable
2. configure terminal
3. ephone-dn dn-tag [dual-line]
4. call-waiting beep [accept | generate]
5. call-waiting ring
6. end
http://www.cisco.com/en/US/docs/voice_ip_comm/cucme/admin/configuration/guide/cmecover.html#wp1117436
Here is the reference for "Hold" indication :)
On-Hold Indicator
On-hold indicator is an optional feature that generates a ring burst on idle IP phones that have placed a call on hold. An option is available to generate call-waiting beeps for occupied phones that have placed calls on hold. This feature is disabled by default.
LED color display for hold state, also known as I-Hold, is supported in Cisco Unified CME 4.0(2) and later versions. The I-Hold feature provides a visual indicator for distinguishing a local hold from a remote hold on shared lines on supported phones, such as the Cisco Unified IP Phone 7931G. This feature requires no additional configuration.
SCCP: Enabling On-Hold Indicator
The Call Hold feature is available by default. To define an audible indicator as a reminder that a call is waiting on hold, perform the following steps.
SUMMARY STEPS
1. enable
2. configure terminal
3. ephone-dn dn-tag [dual-line]
4. hold-alert timeout {idle | originator | shared}
5. end
From this good doc;
http://www.cisco.com/en/US/docs/voice_ip_comm/cucme/admin/configuration/guide/cmering.html#wp1013688
Hope this helps!
Rob
