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Cisco Bug: CSCuo74745 - Hold/Resume on calls from IP phone to PSTN drop

Last Modified

Dec 31, 2019

Products (1)

  • Cisco Unified Communications Manager (CallManager)

Known Affected Releases

9.1(2.11900.12)

Description (partial)

Symptom:
Hold/Resume on calls from IP phone to PSTN drop

Conditions:
1. Duplex streaming enabled for Moh/Ann.
2. Customer stated that when a call is placed from IP Phone to PSTN number it connects fine. But when call is put on hold and then resumed, it drops. I observed that during the hold transaction following happens in the leg between CUBE and CCM
 
  CCM                                   SONUS
  
  ---->Invite(sdp inactive)       
                                  <----200 Ok (sdp inactive)
								  
-----> Invite (no sdp)
                               <---200 Ok (with sdp)
----> ACK(sdp umoh port and ip)

                               <---Re-invite (with same sdp)
 ----> 200 Ok (sdp umoh with same port and ip)

For the first two times during hold CCM responds to the RE-Invite from Sonus with 200 Ok . However during third instance of hold when Sonus sends RE-Invite as in the above flow, CCM fails to respond with 200 Ok. After 10 seconds Sonus sends BYE probably due to timeout. Which was customer complaint that after 10 seconds call drops

Third Re-Invite from the provider contains the same sdp except for removing dtmf cap RFC2833 which causes Moh Agena Interface to close and reopen. AgenaInterface should not need to close and re-open channel if only DTMF cap is changed in the mid-call offer and the device is Moh or ANN
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