[Asterisk-Users] No ring tone on outgoing calls

[Tim Sharp]

I am running on 1.2.7.1 and have an intermittent problem when making outgoing calls.  Sometimes the calling party does not hear the ring tone in their handset, but the call goes through.  From my extension I have only had 3 calls like this in the last couple of weeks, other people have had 3 or 4 calls in a single day and then not have a problem for a couple of days.  The called phone number is not the problem because sometimes it works and sometimes not.  We have both Aastra and Cisco phone sets and the problem occurs on both of them.  We have SIP to PRI connections.  I believe that this problem started after we upgraded from 1.0.9 but not 100 percent sure of that.  Any help or suggestions that you have would be appreciated.  Thank you,  Tim