[cisco-voip] CUCM SIP Early Attended Transfers

[Nick Barnett]

My experience is that it isn't going to give ringback to PSTN phone A (step
7) when going back through a CUBE without forcing MTP.

This was called out as a caveat in the SIP integration guide for AT&T flex
reach via CUBE.
https://www.cisco.com/c/dam/en/us/solutions/collateral/enterprise/interoperability-portal/flexible-reach.pdf



On Mon, Apr 25, 2016 at 1:59 PM, Anthony Holloway <
avholloway+cisco-voip at gmail.com> wrote:

> All,
>
> Does anyone have any experience with CUCM, SIP Phones, SIP Trunks, and
> early attended transfers (AKA hitting the transfer button a second time
> quickly)?  I'm not hearing ringback on the transferee phone.
>
> Components in play:
>
> CUCM 10.5(2)
> CUBE 15.4 (SIP-SIP)
>
> Scenario:
>
>    1. PSTN Phone A calls into enterprise
>    2. IP Phone B answers
>    3. IP Phone B Presses Transfer Key
>    4. PSTN Phone A hears MOH
>    5. IP Phone B Dials Transfer Target and hears ringback
>    6. IP Phone B Presses Transfer Key Again
>    7. PSTN Phone A hears silence until call connects then two way audio
>
> I found this reference in the CUCM System Guide on SIP:
>
>
> http://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/sip_msg/line_std/11_0_1/CUCM_BK_SB03D18E_00_sip-line-messaging-standard-1101/CUCM_BK_SB03D18E_00_sip-line-messaging-standard-1101_chapter_00.html#CUCM_CN_E798E831_00
>
> Specifically these two seemingly contradictory sentences:
>
> "The transferee receives a ringback while the target phone is alerting."
>
> "The transferee will not receive a ringback although the target is
> alerting."
>
> Seems like it's just not going to work.  What do you think?
>
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>
>
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