Release Notes

14
Release Notes for Cisco TelePresence System Software Release 1.10
Important Notes for 1.10.x Releases
For all SCCP and SIP firmware upgrades from firmware release versions earlier than 8.3(3) to version
8.5(3) or a later release, you must first upgrade your firmware to version 8.5(2). Once you have upgraded
to version 8.5(2), you can upgrade your Cisco Unified IP Phone to version 8.5(3) or a later release.
See the Installation Notes section of the Cisco Unified IP Phone Release Notes for Firmware Release
8.5(3) (SCCP and SIP) for download instructions.
• SDP and SRTP with CTS Release 1.10.0
Customers who are deploying their B2B infrastructure with secure trunks to ASR/SBC secured by using
TLS/Encryption, may experience call drops unless specific scripts are installed and configured on the
ASR/SBC devices. Once the scripts and configuration are in place, certain SDP attributes are
manipulated to enable SBC to unblock the SIP messages to and from Unified CM.
The following is an overview of the configuration steps:
1. Upload attached srtp.lua script to your ASR1k.
2. Define two SDP editors, for example to_rtp_avp and to_rtp_savp.
3. Configure a script set, as shown in the following example:
script-set 2 lua
script srtp
filename bootflash:srtp.lua
load-order 100
type full
complete
active-script-set 2
4. Use the SDP editor on both the inbound and outbound adjacencies:
– Ask SBC to modify the SDP calling to_rtp_avp before-receive
– And calling to_rtp_savp after-send
editor-type editor
editor-list before-receive
editor 1 to_rtp_avp
editor-list after-send
editor 1 to_rtp_savp
5. Create three editor headers:
a. tp-to-x-supported
b. tp-to-supported
c. tp-add-x-srtp-fb
The first two are used in the inbound side, which will detect if any X-cisco-srtp-fallback tag gets into
the supported header and then adds an srtp-fb header that includes the X-cisco-srtp-fallback tag (if
present). The third one changes the internal srtp-fb header to the supported header prior to sending on
the wire. The following is an example configuration:
adjacency sip peer2
header-editor inbound tp-to-supported
editor-list before-receive
editor 1 to_rtp_avp
editor 2 tp-to-x-supported
adjacency sip peer1
header-editor outbound tp-add-x-srtp-fb
See the following documents for support:
– Cisco ASR 1000 Series Aggregation Services Routers home page