Hi all, can someone please assist or advise us with a call quality problem? The UC has two analog trunks connected to two FXO ports, to allow calls to and from the PSTN. They have had various call quality problems since the system was installed 18 months ago, and some of these were traced to faulty lines at the telco. However, the lines are now testing OK, but on external calls, the sound is quite poor, with moderate amount of background "hiss". We again tested the analog trunks by plugging a phone straight in, and all was OK. We also tried the FXO tuning wizard, but it reports all is set correctly. Changing the gain also had no effect on the quality. It appears to be a problem with the conversion of IP traffic to analog signalling inside the UC, as IP  phone to IP phone calls are crystal clear. Connecting an analog phone to the FXS port and calling the PSTN also produced clear results, eliminating the FXO ports from the causes. Any advice or pointers will be gratefully received! ... View more

We have a CUCM routing external calls out through a Cisco IOS H.323 gateway to an ITSP, using SIP for the onward connections.  We are using rtp-nte relay for the dtmf tones and these function on 99% of remote IVR menu systems etc. We have some remote menu systems that we cannot use however, but the ITSP is insisting the problem is with our PBX (the IOS gateway).  They say the problem is that we are sending the NTE events with a duration of "0".  I cannot see how to configure the length of these, and to be honest I did think that it was the ITSP onward gateways that would translate the NTE packets to a default tone length. Can I ask if anyone has been in this situation? I could understand if not tones ever got through, but it is baffling that the majority are fine.  The ITSP supports in-band voice tones (no relay) and NTE RFC 2833. This has been resolved - the solution was to add the below command to the dial-peers pointing to the ITSP (SIP trunk). dtmf-internetworking rtp-nte It appears to work in conjunction with the dtmf-relay rtp-nte command, and defines a clear beginning and end to each tone. This document was generated from the following discussion: SIP rtp-nte DTMF relay tone duration ... View more

We have a CUCM routing external calls out through a Cisco IOS H.323 gateway to an ITSP, using SIP for the onward connections.  We are using rtp-nte relay for the dtmf tones and these function on 99% of remote IVR menu systems etc. We have some remote menu systems that we cannot use however, but the ITSP is insisting the problem is with our PBX (the IOS gateway).  They say the problem is that we are sending the NTE events with a duration of "0".  I cannot see how to configure the length of these, and to be honest I did think that it was the ITSP onward gateways that would translate the NTE packets to a default tone length. Can I ask if anyone has been in this situation? I could understand if not tones ever got through, but it is baffling that the majority are fine.  The ITSP supports in-band voice tones (no relay) and NTE RFC 2833. ... View more

Please assist in a design problem we have iminent.  I need to replace an ASA with an IOS firewall router, and am not sure how to migrate the NAT configuration.  Specifically, there is an interface "3rdparty" that has onward connectivity to other private addresses, so our internal addressing is hidden.  For some reason there are static NAT rules in different directions across the interface, but at present I cannot see why.  Thinking in router terms, all that springs to mind is the inside and outside tags for the interfaces, but also that it might need "overlapping" NAT to be configured. The ASA NAT config is below: global (OUTSIDE) 1 interface global (INSIDE) 1 interface global (3RDPARTY) 1 interface global (INTERNET) 1 interface global (ADSL) 1 interface nat (INSIDE) 0 access-list INSIDE_nat0_outbound nat (INSIDE) 1 0.0.0.0 0.0.0.0 nat (3RDPARTY) 1 0.0.0.0 0.0.0.0 nat (WIRELESS) 0 access-list NO_NAT_WLS nat (WIRELESS) 1 0.0.0.0 0.0.0.0 nat (VPN-TRANSIT) 0 access-list VPN-TRANSIT_nat0_outbound nat (vlan99) 1 10.99.0.0 255.255.0.0 static (INSIDE,3RDPARTY) 172.31.45.98 10.111.0.104 netmask 255.255.255.255 static (WIRELESS,INSIDE) 10.111.1.0 192.168.27.0 netmask 255.255.255.0 static (INSIDE,WIRELESS) 10.0.0.0 10.0.0.0 netmask 255.0.0.0 static (3RDPARTY,INSIDE) 10.110.0.15 172.31.45.100 netmask 255.255.255.255 static (WIRELESS,INSIDE) Handheld_nat Handheld netmask 255.255.255.255                                   Is it possible all I need is static inside to outside statements, as they are two-way in IOS?  Any ideas or comments will be gratefully received! ... View more