Solved: 7925G Push to Talk (PTT)

john · ‎06-02-2009

Is there any way to configure the 7925G's PTT on UC520 for directed, point-to-point voice call as opposed to group paging? Much like the functions you get with Nextel / Mike handsets?

Marcos Hernandez · ‎06-02-2009

This is supported, but you will need CLI. See below for a sample config between a 7921 adn a 7925. I am using dummy MAC's and making up the ephone and ephone-dn's (you will have to customize to your setup).

In this example, the second line is the PTT line of both phones:

ephone-dn 50
number 1200
label ip-paging
paging
!
ephone-dn 56
number 1201
label intercom
intercom 1200
!
ephone 6
device-security-mode none
mac-address ABCD.ABCD.ABCD
max-calls-per-button 4
paging-dn 50 unicast
type 7921
no auto-line
button 1:39 2:56
!
ephone 41
device-security-mode none
mac-address BACD.BACD.BACD
max-calls-per-button 4
paging-dn 50 unicast
type 7925
button 1:41 2:56

Let us know how it goes,

Marcos

View solution in original post

jjrinehart · ‎06-04-2009

Last year I was trying to mimic exactly what you were talking about. A local hospital was looking at a two-way radio type of solution for their transporters (the folks who ferry patients from one place to another) and I proposed using a UC520 for this purpose. The idea was to issue 7921 phones with headsets to the transporters and use the Wireless LAN throughout the hospital to transport the voice stream. I coupled PTT with a PLAR function so that it would act just like a broadcast radio and mimic the two way radio. I was jazzed when I figured out how to get it to work, the last piece of the puzzle I was able to get from the "Ask an Expert" area at last years Networkers...

Joe Rinehart, MBA, CCIE #14256, CCNP/DP/VP

President, Seattle Cisco Users Group

View solution in original post

Marcos Hernandez · ‎06-04-2009

You could create more DN's like the one below:

!
ephone-dn 56
number 1201
label intercom
intercom 1200
!

And then add speed dials to those DN's. In other words, you build a "dialable" intercom that points to a unicast paging DN.

Let me know,

Marcos

View solution in original post

Marcos Hernandez · ‎06-02-2009

This is supported, but you will need CLI. See below for a sample config between a 7921 adn a 7925. I am using dummy MAC's and making up the ephone and ephone-dn's (you will have to customize to your setup).

In this example, the second line is the PTT line of both phones:

ephone-dn 50
number 1200
label ip-paging
paging
!
ephone-dn 56
number 1201
label intercom
intercom 1200
!
ephone 6
device-security-mode none
mac-address ABCD.ABCD.ABCD
max-calls-per-button 4
paging-dn 50 unicast
type 7921
no auto-line
button 1:39 2:56
!
ephone 41
device-security-mode none
mac-address BACD.BACD.BACD
max-calls-per-button 4
paging-dn 50 unicast
type 7925
button 1:41 2:56

Let us know how it goes,

Marcos

john · ‎06-03-2009

Thanks for the tip Marcos. However, is it possible to make the intercom not for a fixed number? The behavior I am looking for is much like what a user will get with Nextel/Mike PTT where the user will select someone/group from a list of and press PTT to open the com line (similar to Directory-Dial, but using Intercom instead).

Marcos Hernandez · ‎06-04-2009

You could create more DN's like the one below:

!
ephone-dn 56
number 1201
label intercom
intercom 1200
!

And then add speed dials to those DN's. In other words, you build a "dialable" intercom that points to a unicast paging DN.

Let me know,

Marcos

Marcos Hernandez · ‎06-04-2009

One more comment. Make sure you honor the Out of Band Rules for CCA. That way you won't paint yourself into a corner if you still want to keep using CCA.

Marcos

jjrinehart · ‎06-04-2009

Last year I was trying to mimic exactly what you were talking about. A local hospital was looking at a two-way radio type of solution for their transporters (the folks who ferry patients from one place to another) and I proposed using a UC520 for this purpose. The idea was to issue 7921 phones with headsets to the transporters and use the Wireless LAN throughout the hospital to transport the voice stream. I coupled PTT with a PLAR function so that it would act just like a broadcast radio and mimic the two way radio. I was jazzed when I figured out how to get it to work, the last piece of the puzzle I was able to get from the "Ask an Expert" area at last years Networkers...

Joe Rinehart, MBA, CCIE #14256, CCNP/DP/VP

President, Seattle Cisco Users Group