Hello, we are using 5508 WLCs with 8.5.140.0. As we want to decrease the amount of SSIDs we would like to merge our voice and the regular laptop computer SSIDs. We would use ISE to place the wifi phones in a separate vlan and set the Platinum QoS. We got RF grouping (auto 600 secs), TPC (every 600 secs) and DCA (12 hour interval!) enabled. We really don't want to decrease the performance of our wifi connected laptops and this is my concern.   I read several articles here at the forum and on cisco.com. I understand that 0-7 are for the different priorities and off chann scanning is used to "listen" on other channels than the one currently using, resulting in not serving clients while scanning. I understand that 100 ms and prio 4-6 works fine for voice calls due to 20 ms sample duration so it won't go off-chann while calls are active.   Can I enable prio 0-7 and set the defer time to 10 seconds? I assume that it will go off channel then only when no user traffic happend for the last 10 seconds. Is this correct? Can I set it like this? Any other suggestions?   Thank you, any help is appreciated!   ... View more

Hi guys, I am currently trying to set up a SIP trunk with T-Mobile in Czech Republic but outbound calls are not working. At given time all numbers of the traditional PBX will be ported to the SIP trunk but ITSP said that we can already make outgoing calls for testing. They said that they mapped one number which is currently unknown to us. When we try to make an outbound call I can see our INVITE (with sdp) to ITSP, a 100 TRYING comes back, followed by 183 with sdp. Then RTP stream from ITSP to our CUBE starts. Then, a second later - I assume here is the problem - our CUBE sends an INVITE again followed by a 183. This repeats sometimes while RTP is still streamed but call is never established.. After almost 20 seconds we get a few 504 server timeouts.   The 183 contains require 100rel. I tried to set 100rel required on voice service voip under sip and at dial-peer, didn't help at all. On SIP Profile of trunk between CUCM and CUBE SIP Rel1xx Options is set to Send PRACK if 1xx contains sdp and early offer support is set to best effort.   CUBE runs on a 4331 with 16.6.6 (first we tested 16.6.5 - same issue). Topology looks like: Phone > CUCM > SIP Trunk > CUBE > ITSP SBC   I attached a zipped packet capture of the WAN interface pointing to ITSP. I could post partially the config if needed. Any idea what I could try next? Thank you! ... View more

Hello guys,   We're using selfsigned certs on our voice routers for encrypted IOS (audio) conference bridges. Please find below the command set. Unfortunately the exported pem is only valid until 01 January 2020. I didn't find out how to generate one with a longer lifetime / later expiry date.   Does somebody know how to accomplish?   Thank you!     crypto key generate rsa general-keys label routername modulus 2048 crypto pki trustpoint routername  enrollment selfsigned  hash sha256  rsakeypair routername  fqdn none  revocation-check none  subject-name CN=routername  exit crypto pki enroll routername crypto pki export routername pem terminal     routername#show crypto pki certificates Router Self-Signed Certificate   Status: Available   Certificate Serial Number (hex): 01   Certificate Usage: General Purpose   Issuer:     cn=routername   Subject:     Name: routername     cn=routername   Validity Date:     start date: 09:04:40 CET Feb 14 2019     end   date: 01:00:00 CET Jan 1 2020   Associated Trustpoints: routername   Storage: nvram:routerna#1.cer Last test was on an 4331 router with IOS XE 16.6.5 but problem seem to be the same on other hardware (like 2911) with older non-XE IOS.     ... View more