[cisco-voip] strange shared line behavior on 88XX phones

[Erick Wellnitz]

The 200 comes relatively quickly and the CM sends the ACK back quickly.
It's only the 487 that is delayed and not all the time.  The time frame in
the console logs matches the CM traces so it doesn't look like any funny
business on the network.

This one is a head scratcher for sure.

On Wed, Sep 30, 2015 at 3:08 PM, Daniel Pagan <dpagan at fidelus.com> wrote:

> Interesting… Out of curiosity, there should first be a CANCEL to the IP
> phones where the call wasn’t answered. The phones should then 200 that
> CANCEL request, and then send the 487 final response to the original INVITE
> for the call. Do you see the 487 final response six seconds *after* the
> CANCEL/200 exchange? I ask only because this should help you determine
> where the delay is coming from - the phone or CUCM.
>
>
>
> - Dan
>
>
>
> *From:* cisco-voip [mailto:cisco-voip-bounces at puck.nether.net] *On Behalf
> Of *Erick Wellnitz
> *Sent:* Wednesday, September 30, 2015 3:51 PM
> *To:* Lelio Fulgenzi <lelio at uoguelph.ca>
> *Cc:* cisco-voip at puck.nether.net
> *Subject:* Re: [cisco-voip] strange shared line behavior on 88XX phones
>
>
>
> Finally had the behavior repeat.
>
>
>
> Found in the console logs and the CM traces that a couple of the phones
> are, for some reason, delaying their 487 - Request Cancelled response for
> up to 6 seconds from when the call is answered.
>
>
>
> Sent to TAC to see what they have to say.
>
>
>
> On Wed, Sep 30, 2015 at 11:09 AM, Lelio Fulgenzi <lelio at uoguelph.ca>
> wrote:
>
> turns out it is written.
>
>
>
>
> http://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/7_1_2/ccmsys/accm-712-cm/a03dn.html#wp1100362
>
>
>
> Shared Line Restrictions
>
> The following restrictions apply to shared lines:
>
> <snip>
> •Do not configure shared-line appearances on the primary lines of the
> phones; for example, if two phones have a shared-line appearance, only one
> of the phones should have the primary line configured as shared (the other
> phone should have the secondary line configured as shared).
> <snip>
>
>
>
> In version 10 it becomes a suggestion though. Interesting.
>
>
>
>
> http://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/10_0_1/ccmsys/CUCM_BK_SE5FCFB6_00_cucm-system-guide-100/CUCM_BK_SE5FCFB6_00_cucm-system-guide-100_chapter_010001.html#CUCM_RF_S05975F9_00
>
>
> Shared Line Suggestions
> Do not configure shared line appearances on primary lines as certain
> feature interactions are impacted. Settings of the primary line are
> applicable to the shared line. For example: if two phones have a
> shared-line appearance, only one phone should have the primary line
> configured as shared to avoid unexplained post configuration behavior.
>
>
>
> ---
> Lelio Fulgenzi, B.A.
> Senior Analyst, Network Infrastructure
> Computing and Communications Services (CCS)
> University of Guelph
>
>
>
> 519‐824‐4120 Ext 56354 <519%E2%80%90824%E2%80%904120%20Ext%2056354>
> lelio at uoguelph.ca
> www.uoguelph.ca/ccs
> Room 037, Animal Science and Nutrition Building
> Guelph, Ontario, N1G 2W1
>
>
> ------------------------------
>
> *From: *"Erick Wellnitz" <ewellnitzvoip at gmail.com>
> *To: *"Lelio Fulgenzi" <lelio at uoguelph.ca>
> *Cc: *cisco-voip at puck.nether.net
> *Sent: *Wednesday, September 30, 2015 12:20:51 PM
> *Subject: *Re: [cisco-voip] strange shared line behavior on 88XX phones
>
>
>
> It is on a fair number of them.  They didn't have the issue on 8.6.2 with
> the same firmware.
>
>
>
> We're waiting on the next occurrence to gather traces.
>
>
>
> On Wed, Sep 30, 2015 at 10:04 AM, Lelio Fulgenzi <lelio at uoguelph.ca>
> wrote:
>
>
>
> I recall there being an (un)written rule where shared lines should not be
> the primary line. It could cause issues.
>
>
>
> Are the shared lines the first DN on the phone?
>
>
>
> Lelio
>
>
>
> ---
> Lelio Fulgenzi, B.A.
> Senior Analyst, Network Infrastructure
> Computing and Communications Services (CCS)
> University of Guelph
>
>
>
> 519‐824‐4120 Ext 56354 <519%E2%80%90824%E2%80%904120%20Ext%2056354>
> lelio at uoguelph.ca
> www.uoguelph.ca/ccs
> Room 037, Animal Science and Nutrition Building
> Guelph, Ontario, N1G 2W1
>
>
> ------------------------------
>
> *From: *"Erick Wellnitz" <ewellnitzvoip at gmail.com>
> *To: *cisco-voip at puck.nether.net
> *Sent: *Wednesday, September 30, 2015 12:00:20 PM
> *Subject: *[cisco-voip] strange shared line behavior on 88XX phones
>
>
>
> anyone seen issues with the 88xx phones on firmware 10.3(1) and CUCM
> 10.5.2 SU1 where the line starts ringing on some phones right away and some
> start ringing up to 15 seconds later.  Some also experience ringing after
> the call is answered up to 15 seconds after answered.
>
>
>
> 88xx phones are the only ones exhibiting this behavior.  Another
> consideration is that this shared line is on 17 devices.
>
>
>
> Thanks for any insight!
>
>
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