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Issues Resolved in Release 2.5.3
6 RN-001029-04, Release 2.5.3, Rev 05
IP Phone Release Notes 2.5.3
DEF19446 When a phone receives an INVITE, the user accepts the call (ACK) and the phone sends an OK
response. If the Call Manager sends a Re-INVITE before the ACK, the phone freezes.
This is now corrected.
DEF19454 If the phone is set to use Secure Real-Time Transport Protocol (SRTP) with a setting of "SRTP
Preferred" mode, and in a non-SRTP session the phone receives a re-INVITE with Session
Description Protocol (SDP) containing a crypto key, the phone answers with an OK response
containing no crypto key in SRTP. The peer sends SRTP but the phone cannot decrypt it (since it's
not in SRTP-mode). Phone sends unencrypted RTP.
On a re-INVITE the phone now sets the local SDP. If there is a change involving the crypto key, the
change is now included in the OK response.
DEF19455 When a re-INVITE with no SDP comes into a phone with an on-hold call, the phone doesn’t respond
with its Codec list and crypto key.
This is now corrected.
DEF19466 When a 67xxi phone is communicating with another 67xxi phone using SRTP for voice,
communication works correctly. However, after approximately 20 minutes of communication, the line
goes silent with no audio, even though SRTP packets are still being exchanged.
This is now corrected.
DEF19588 When the phone registered to the primary server, static TLS authentication performed as expected
(phone used trusted certificate to validate server certificate). When the primary server failed and the
phone performed a failover to the backup registrar, the certificate for the backup registrar was signed
by the same root CA but the phone refused the certificate with “unknown CA”.
This has now been corrected and the phone now accepts the applicable certificate(s) from the
backup registrar.
ENH17750 Previously, the IP Phones did not parse Session Description Protocol (SDP) Annex B attribute when
using a G.729AB codec. This caused an interoperability issue.
The phone now fully supports the G.729 Annex A and Annex B.
ENH17935 A phone enabled with Link-Layer Discovery Protocol (LLDP) does not set the VLAN ID when
receiving an LLDP frame containing Type-Length-Values (TLV) which sets the data and VLAN ID
from the switch.
The IP Phones now accept LLDP frames and the phones set the VLAN ID correctly.
ENH19694 The default Network Time Protocol value on the IP Phones is now set to “aastra.pool.ntp.org.” This
resolves some issues with certificate validation.
DEF20397 Network Packet Loss Rate (NLR) values provided by phone were missing fractional values and
rounding was not always done correctly.
This is now corrected. NLR values now contain fractions if they exist and rounding is done correctly.
Usability
DEF18026 If the “Switch UI Focus to Ringing Line” parameter is disabled, and two calls come into the phone
at the same time (Line 1 and Line 2), when the User picks up the call on Line 1, a ringing is heard in
the handset from Line 2.
This is now corrected. A User no longer hears ringing in the handset when picking up the first Line.
Issue Number Description of Fix