Acme Packet Duplicate SIP Attributes

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Issue: Acme Packet SBC sending duplicate SIP attributes which causes MS Lync 2013 to drop the call. However, Cisco CUBE and Cisco Voice Gateways have no problem in processing duplicate attributes.

v=0
o=- 1385372910 1385372910 IN IP4 192.168.1.1
s=-
c=IN IP4 192.168.1.1
t=0 0
m=audio 10178 RTP/AVP 0 8 101
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15
a=silenceSupp:off – – – –
a=ptime:20

Platform: Acme Packet Net-Net 3800 with software version SCX 6.3.7

Solution: Use HMR to remove all attributes and re-add attributes with single entry before sending to MS Lync 2013.
Acme Packet acknowledged this as a bug in the code. The patch has been released on 4th of December 2013 and available on Acme Packet Support page for download.

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