[cisco-voip] curious - no DNS SRV for SIP trunk to IM&P in HA

[Lelio Fulgenzi]

Thanks Brian. 

I had to read the bug twice. It's the troubleshooter on CUPS, but it's testing what's configured on CUCM by the sounds of it. 

I think I will play it safe and use IP addresses on the CUCM configuration pointing to the HA CUPS pair. And on the CUPS server, I will go ahead an use an SRV record since I want to be able to point to more than one CUCM server. 

Another question arises though. I remember when playing with intercluster trunks, it had to be fully meshed, so all trunk members on one cluster had to point to all members on the other cluster, or calls would fail. 

Does a SIP trunk have to be fully meshed as well? 

For example, if the device pool of the SIP trunk includes subA, subB and subC, do I have to make sure that the SRV records I'm using on the CUPS server have those three servers included? 

I was also considering checking off "make active on all nodes" - but I'm not sure of the ramifications of that. I'd have to probably write the SRV record properly so that the publisher is (never) used or used only as a last resort. 

Thanks! 



--- 
Lelio Fulgenzi, B.A. 
Senior Analyst, Network Infrastructure 
Computing and Communications Services (CCS) 
University of Guelph 

519‐824‐4120 Ext 56354 
lelio at uoguelph.ca 
www.uoguelph.ca/ccs 
Room 037, Animal Science and Nutrition Building 
Guelph, Ontario, N1G 2W1 

----- Original Message -----

From: "Brian Meade" <bmeade90 at vt.edu> 
To: "Lelio Fulgenzi" <lelio at uoguelph.ca> 
Cc: "Cisco VoIP Group" <cisco-voip at puck.nether.net> 
Sent: Monday, January 18, 2016 4:56:18 PM 
Subject: Re: [cisco-voip] curious - no DNS SRV for SIP trunk to IM&P in HA 

Looks like it may just be the CUPS Troubleshooter Tool doesn't know how to handle it- https://tools.cisco.com/bugsearch/bug/CSCue72366 

So it looks like it will work as an SRV but may fail in the troubleshooting tool. It looks like this was because IM&P/CUPS disn't support resolving SRVs until recently- https://tools.cisco.com/bugsearch/bug/CSCui67346 

On Mon, Jan 18, 2016 at 3:47 PM, Lelio Fulgenzi < lelio at uoguelph.ca > wrote: 




Just reading through some documentation (see link below) and it states that when configuring the SIP trunk from CUCM to the IM&P cluster, I can not use DNS SRV records if I'm using HA. Tells you to use IP address or FQDN. 

Just wondering what others have thought about this. I'll go ahead and use IP address, but it struck me as odd. 


http://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/im_presence/configAdminGuide/9_1/CUP0_BK_C68AA046_00_config-admin-guide-imp-91/CUP0_BK_C68AA046_00_config-admin-guide-imp-91_chapter_0101.html#CUP0_TP_SBE6AFC1_00 

--- 
Lelio Fulgenzi, B.A. 
Senior Analyst, Network Infrastructure 
Computing and Communications Services (CCS) 
University of Guelph 

519‐824‐4120 Ext 56354 
lelio at uoguelph.ca 
www.uoguelph.ca/ccs 
Room 037, Animal Science and Nutrition Building 
Guelph, Ontario, N1G 2W1 


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