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[reSIProcate] SDP Hold question


I have a question about constructing a Hold SDP. I'm using a eyeBeam and a Grandstream phone.
 
In the 2 examples below, the first re-Invite, (in magenta) is generated by pressing the Hold button on an active call on the eyeBeam phone. The audio becomes muted. Pressing Hold again unmutes the call and audio is again established. This re-Invite sequence is shuffled through my B2B.
 
The 2nd re-Invite, (in green) is generated by my B2B on behalf of the eyeBeam phone (3rd party call control). Audio becomes garbled and I cannot reconnect the call. Nothing is sent to the eyeBeam phone.
 
When constructing the Hold SDP in the B2B, all I change is the version number in the origin line, by using the last received SDP (the manual un-Hold by the eyeBeam phone) and then incrementing the version value in the Origin line.
 
Is there something else I need to do?? Do I need to send the answer (220 OK w/SDP) from the GrandStream phone I receive back to the eyeBeam?
 
Any thoughts??
 
 
INVITE sip:55504@xxxxxxxxxxxx SIP/2.0
Via: SIP/2.0/UDP 135.8.116.33:5060;branch=z9hG4bK-d87543-e034f66b151da125-1--d87543-;rport
Max-Forwards: 70
Route: <sip:135.8.52.181:5060;lr>
Contact: <sip:55123@xxxxxxxxxxxx:5060>
To: <sip:55504@xxxxxxxxx>;tag=4e7d7140a8da0070
From: "IC 7.1 B2B"<sip:55123@xxxxxxxxx>;tag=00763b3d
Call-ID: 9d476254395d7709ZTU2NTMzOTg2ZDMyYzc4MWNiYjc4MzMzMGUwNGJkYWM.
CSeq: 3 INVITE
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, NOTIFY
Content-Type: application/sdp
Proxy-Authorization: Digest username="55123",realm="avaya.com",nonce="MTE2NDE1NzE0NjpTREZTZXJ2ZXJTZWNyZXRLZXk6Mjc5NTYwOTY2",uri="sip:55504@xxxxxxxxxxxx",response="e3aca7e0119f70949d78173fc72e446a",algorithm=MD5
User-Agent: AVSipSwitch 1.02b-1
Content-Length: 177
 
v=0
o=- 17377554 17383243 IN IP4 135.8.116.157
s=eyeBeam
c=IN IP4 135.8.116.157
t=0 0
m=audio 7478 RTP/AVP 0
a=alt:1 1 : 79B29E65 00000006 135.8.116.157 7478
a=sendonly
 
INVITE sip:55504@xxxxxxxxxxxx SIP/2.0
Via: SIP/2.0/UDP 135.8.116.33:5060;branch=z9hG4bK-d87543-915302260a54c071-1--d87543-;rport
Max-Forwards: 70
Route: <sip:135.8.52.181:5060;lr>
Contact: <sip:55123@xxxxxxxxxxxx:5060>
To: <sip:55504@xxxxxxxxx>;tag=4e7d7140a8da0070
From: "IC 7.1 B2B"<sip:55123@xxxxxxxxx>;tag=00763b3d
Call-ID: 9d476254395d7709ZTU2NTMzOTg2ZDMyYzc4MWNiYjc4MzMzMGUwNGJkYWM.
CSeq: 5 INVITE
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, NOTIFY
Content-Type: application/sdp
Proxy-Authorization: Digest username="55123",realm="avaya.com",nonce="MTE2NDE1NzE0NjpTREZTZXJ2ZXJTZWNyZXRLZXk6Mjc5NTYwOTY2",uri="sip:55504@xxxxxxxxxxxx",response="e3aca7e0119f70949d78173fc72e446a",algorithm=MD5
User-Agent: AVSipSwitch 1.02b-1
Content-Length: 177
 
v=0
o=- 17377554 17385540 IN IP4 135.8.116.157
s=eyeBeam
c=IN IP4 135.8.116.157
t=0 0
m=audio 7478 RTP/AVP 0
a=alt:1 1 : 79B29E65 00000006 135.8.116.157 7478
a=sendonly
 
 
 
Bill Kovar
bkovar@xxxxxxxxx
Avaya, Inc.
(732) 852-2609