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ASA Phone Proxy -

I have a ASA 5510 8.4(2) setup with Phone proxy and its works perfect (7945's, secure, etc)....for one call. Then the next call i have no audio (or one way sometimes).

Here is what I have come to find out:

When I make a call it works perfect, but I have to wait for the media-session to clear when running "sh phone-proxy media-sessions

ASA# sh phone-proxy media-sessions
2 in use, 6 most used
Media-session: :: client ip
  Lcl RTP conn to 10.1.x.x/2000 tx_pkts 872 rx_pkts 869
  Rmt master key and salt 00000000000000000000000000000000
  Lcl master key and salt 00000000000000000000000000000000

Media-session: :: client ip 10.1.x.x/2000
  Lcl SRTP conn to tx_pkts 865 rx_pkts 872
  Rmt master key and salt 8644e7924900c0bebb8eaba99ca2e1d5
  Lcl master key and salt 7c9c61edf2f9c7bf03fe653cedefefc5

Once it shows 0 in use after 5 minutes or so, i can make one more call, and so on..

So my question is, is there a way to clear the session immediately? And is this a licensing problem since I am using the default 2- UC proxy licenses? And if i upgrade (approximately 6 remote phones eventually) do I need to account for multiple calls simultaneously and in a row ( as in each person makes 3 calls in a 5 minute span, do I need like 30 licenses)?



Everyone's tags (9)
Community Member

ASA Phone Proxy -


I got a temporary license for 25 UC proxy sessions from Cisco. Same issue. I can rule that out for now...HELP!

Community Member

ASA Phone Proxy -

Anyone? TAC was no help. Couldnt figure it ou

ASA Phone Proxy -

Take a look on this doc:

But if you have a case open in Cisco TAC i suggest you try to solve this together with the engineer responsible for your case.


Community Member

ASA Phone Proxy -

Hi Nathan,

I have done it . And if u want any type of help on ASA UC PROXY Setup .

ASA UC PROXY will work on Session .

One phone call = 1 session .

For your 2nd query

You can not clear the session immediately.

Because this is working on sessions . If you will clear the session then your phone will again search your tftp & will take some time for regiatration . (areound 15sec to 1 minutes .)

I also updated the same for my customer . I have 50 UC PROXY license in  my ASA .

For any type of quesry you can mail me .

Thanks & regards

Vishal thakur

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