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Rolando Valenzuela
Enthusiast

Phone Service using FQDN

Hi guys

I would like to know if it is possible to set a Phone Service (specifically Extension mobility) using a FQDN in the Service URL

Currently I'm using 

http://10.10.14.10:8080/emapp/EMAppServlet?device=#DEVICENAME#

But I want to start using something similar to:

http://extmobility.office.com:8080/emapp/EMAppServlet?device=#DEVICENAME#

but is not working the ping works from my PC and from the server, in the examples you can se that is load balancing correctly.

C:\>ping extmobility.office.com

Pinging extmobility.office.com [10.10.15.10] with 32 bytes of data:

Reply from 10.10.15.10: bytes=32 time=92ms TTL=59

Reply from 10.10.15.10: bytes=32 time=92ms TTL=59

Reply from 10.10.15.10: bytes=32 time=92ms TTL=59

Reply from 10.10.15.10: bytes=32 time=92ms TTL=59

admin:utils network ping extmobility.office.com

PING extmobility.uskc.office.eeft.com (10.10.14.10) 56(84) bytes of data.

64 bytes from kceft-cucm01p.office.com (10.10.14.10): icmp_seq=1 ttl=64 time=0.023 ms

64 bytes from kceft-cucm01p.office.com (10.10.14.10): icmp_seq=2 ttl=64 time=0.058 ms

64 bytes from kceft-cucm01p.office.com (10.10.14.10): icmp_seq=3 ttl=64 time=0.038 ms

64 bytes from kceft-cucm01p.office.com (10.10.14.10): icmp_seq=4 ttl=64 time=0.041 ms

I even tried using http://www. but nothing works, any idea of the correct setup for this?

I checked

http://www.cisco.com/en/US/products/sw/voicesw/ps556/products_tech_note09186a0080a80386.shtml#t1

http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/admin/7_0_1/ccmfeat/fsem.pdf (Page 17)

http://www.cisco.com/en/US/products/sw/voicesw/ps556/products_tech_note09186a0080b1f6b5.shtml#backinfo

All the links said that is possible, but none of them gave an example of the correct configuration.

Thank you!!!

1 ACCEPTED SOLUTION

Accepted Solutions

Although Cisco recommend not using round robin it can be the best option available if the customer does not have a load balancer available. The only other alternative is configuring a backup EM service, subscribing the phones to both and hoping that the users will remember to use it. I do sometimes use round robin and explain to the customer it is a bodge.

Anyway your URL looks fine. I would try SSH'ing into a phone and trying to ping the hostname. Instructions on how to do this are available at the link below:

http://iptbuzz.blogspot.co.uk/2011/09/how-to-ssh-into-cisco-ip-phone.html

If you cannot ping it by hostname then check your DNS setup.

View solution in original post

6 REPLIES 6

Does the phone have a DNS server in it's DHCP lease?

Did you define a Secure URL on the EM service? If yes, remove it for a moment as that would subject it to the ITL and lead us down a different troubleshooting path.

PS- Are you using a real load balancer or DNS round robin? The SRND explicitly recommends against the later.

Please remember to rate helpful responses and identify helpful or correct answers.

Does the phone have a DNS server in it's DHCP lease?

Yes, they do, in fact are the same for my PC.

Did  you define a Secure URL on the EM service? If yes, remove it for a  moment as that would subject it to the ITL and lead us down a different  troubleshooting path.

No, is unsecured.

PS- Are you using a real load balancer or DNS round robin? The SRND explicitly recommends against the later.

I'm not quite sure... let me back with you tommorrow for this.

Hi Jonathan,

I double check and yeah... we are using DNS round robin.

Although Cisco recommend not using round robin it can be the best option available if the customer does not have a load balancer available. The only other alternative is configuring a backup EM service, subscribing the phones to both and hoping that the users will remember to use it. I do sometimes use round robin and explain to the customer it is a bodge.

Anyway your URL looks fine. I would try SSH'ing into a phone and trying to ping the hostname. Instructions on how to do this are available at the link below:

http://iptbuzz.blogspot.co.uk/2011/09/how-to-ssh-into-cisco-ip-phone.html

If you cannot ping it by hostname then check your DNS setup.

View solution in original post

Sorry for the BIG BIG delay with this guys!

I tried what James suggested... I can start the ssh sesion but I cannot access to the phone, I tried with:

default-cisco

default-cisco123

default-admin

default-123cisco

I know "default" is the correct username, but I don't know the password

Rolando Valenzuela
Enthusiast

Hi guys, just an FYI

at the end I decided to create two instance of Ext mobility, because everywhere I looked said that is not recommended to uses DNS server.

Thanks for all the help!!!

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