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SIp OPTIONS PING - respond with fax capabilities?

dino55088
Level 1
Level 1

Hi there,

i have a CUCM sending SIP OPTIONS PING to  a CUBE,

when CUBE reponds , it sends like an SDP back with all fax capabilities and not sure where this is coming from and why...? I want to remove it:

Jul 12 00:48:02.032: //-1/xxxxxxxxxxxx/SIP/Msg/ccsipDisplayMsg:
Received:
OPTIONS sip:10.10.10.254:5060 SIP/2.0

Via: SIP/2.0/TCP 10.20.20.253:5060;branch=z9hG4bK1cf718012ca2

From: <sip:10.20.20.253>;tag=1153190595

To: <sip:10.10.10.254>

Date: Tue, 12 Jul 2016 14:47:05 GMT

Call-ID: 7ed74000-785102e9-1cf2-fd011a9d@10.20.20.253

User-Agent: Cisco-CUCM9.1

CSeq: 101 OPTIONS

Contact: <sip:10.20.20.253:5060;transport=tcp>

Max-Forwards: 0

Content-Length: 0


Jul 12 00:48:02.036: //-1/xxxxxxxxxxxx/SIP/Msg/ccsipDisplayMsg:
Sent:
SIP/2.0 200 OK

Via: SIP/2.0/TCP 10.20.20.253:5060;branch=z9hG4bK1cf718012ca2

From: <sip:10.20.20.253>;tag=1153190595

To: <sip:10.10.10.254>;tag=4C506DEC-102B

Date: Tue, 12 Jul 2016 00:48:02 GMT

Call-ID: 7ed74000-785102e9-1cf2-fd011a9d@10.20.20.253

Server: Cisco-SIPGateway/IOS-15.2.4.M4

CSeq: 101 OPTIONS

Allow: INVITE, OPTIONS, BYE, CANCEL, ACK, PRACK, UPDATE, REFER, SUBSCRIBE, NOTIFY, INFO, REGISTER

Allow-Events: telephone-event

Accept: application/sdp

Supported: 100rel,timer,resource-priority,replaces,sdp-anat

Content-Type: application/sdp

Content-Length: 379

v=0

o=CiscoSystemsSIP-GW-UserAgent 1549 4471 IN IP4 10.10.10.254

s=SIP Call

c=IN IP4 10.10.10.254

t=0 0

m=audio 0 RTP/AVP 18 0 8 9 4 2 15

c=IN IP4 10.10.10.254

m=image 0 udptl t38

c=IN IP4 10.10.10.254

a=T38FaxVersion:0

a=T38MaxBitRate:9600

a=T38FaxRateManagement:transferredTCF

a=T38FaxMaxBuffer:200

a=T38FaxMaxDatagram:320

a=T38FaxUdpEC:t38UDPRedundancy

1 Reply 1

Dennis Mink
VIP Alumni
VIP Alumni

that is what SIP options do; query capabilities. because they are such lean packets, they are very suitable as a way to verify 'keepalive; status across for instance a CUCM sip trunk.

what exactly is the issue you are trying to fix by wanting to remove these capabilities?

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