[cisco-voip] Audio cut-through delays upon transfer

[Dana Tong]

I just checked this, and it has been enabled already.

Cheers
Dana


From: "Pavan Dave (pavdave)" <pavdave at cisco.com>
Date: Friday, 13 January 2017 at 5:35 am
To: Anthony Holloway <avholloway+cisco-voip at gmail.com>, Dana Tong <dana.tong at yellit.com.au>, "cisco-voip at puck.nether.net" <cisco-voip at puck.nether.net>
Subject: RE: [cisco-voip] Audio cut-through delays upon transfer

To piggy back on this, if you are going to be in situations where calls are going on and off hold and transferring,  setting duplex streaming to “True” on CUCM will also help.

Note To prevent the SDP mode from being set to inactive in a multiple-hold scenario, set the Duplex Streaming Enabled clusterwide service parameter (System > Service Parameters) to True.
http://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/8_5_1/ccmsys/accm-851-cm/a08trnk.html#wp1149990 (Step 10 under Table 41-1)

Regards,
Pavan Davé
Contact Center TAC Engineer
Cisco Systems – Richardson, TX, USA

From: cisco-voip [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Anthony Holloway
Sent: Thursday, January 12, 2017 12:51 PM
To: Dana Tong <dana.tong at yellit.com.au>; cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] Audio cut-through delays upon transfer

This sounds like the old too-many-messages-are-required-to-make-the-transfer-happen scenario.  Ok, I just made up that name, but basically the SIP messages are just busy doing whatever SIP messages do, to make the transfer happen.  From stopping media, to invoke MOH, to tearing down MOH, to transferring, to establishing media, it's just a lot, and takes a long time.

You can cut down on the amount of messages in a few ways, but the one I see used most often is the command on the CUBE:

voice service voip
 sip
  mid-call signaling passthru media-change
!

You can read more about it here:
http://www.cisco.com/en/US/docs/ios-xml/ios/voice/cube_proto/configuration/15-2mt/cube-midcall-reinvite.html

On Wed, Jan 11, 2017 at 10:00 PM Dana Tong <dana.tong at yellit.com.au<mailto:dana.tong at yellit.com.au>> wrote:
Hi all,

I have a customer who is reporting a (one-way) audio delay after transferring calls with Cisco Jabber. They are almost all soft-phone users.
There doesn’t appear to be any delays in the signalling.

I’ve just asked them to clarify if this is for all calls or just external calls. PSTN access is via CUBE which is configured for early offer.
When I tested I couldn’t see a problem but the customer insists that there is a delay for media being transmitted to the person who receives the transferred call.

Has anyone seen this before at all?

Cheers
Dana

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