CUCM call preservation when MTP is involved in a call

[voiphub01]

Hi friends,

In my last post, I asked if call manager can preserve the mid call features if primary server is down. Conclusion was 'No'. Phone can't use mid call features when primary call manager is down however if media/RTP is direct between the phones, call will remain active as long user user doesn't disconnect the call. As soon as user disconnects the call, phone will immideately register with secondary call manager.

Now there is second call preservation question. If media doesn't flow directly between the phones and MTP is involved during a call viz RTP flows through MTP and say MTP server goes down, is there any probability for both phones to start sending/receiving RTP through backup MTP server? If not, will call fail?

Regards

[Manish Gogna]

Hi,

Please check "Table 1 Call Preservation Scenarios" of the following link

http://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/9_1_1/ccmsys/CUCM_BK_C5565591_00_cucm-system-guide-91/CUCM_BK_C5565591_00_cucm-system-guide-91_chapter_01011.html#CUCM_RF_C98194B0_00

As per the last scenario ( Device failure - Phone, gateway, conference bridge, transcoder, MTP ) - When a device fails, the connections that exist through the device stop streaming media. The active Cisco Unified Communications Manager recognizes the device failure and clears call-processing entities that are associated with calls in the failed device.

HTH

Manish

[voiphub01]

Hi Manish,

Thanks

To cross-verify, if media flows through MTP and it goes down, call will fail even if secondary MTP server exists.

Regards

[Manish Gogna · Accepted solution]

Hi,

That is correct, the RTP flow will stop between the endpoints involved in the call.

HTH

Manish

[voiphub01]

Thank you very much for the confirmation.