Hi guys,
A strange one, as it seems. Setup:
ISDN - 2911 - CUCM - IP Phone
Calls go through ISDN via 2911 to the IP phone, got silence from ISDN to IP phone. It does work well the other way, I can hear voice coming from IP Phone to ISDN.
The strange part here is the fact, that some of rtp packets go from the gateway to IP phone, but only a few and the gateway seems to stop sending them almost immediately (tx values do not change during the period of the call and for some reason there are both rtp and rtcp counters >0, even though there is no rtcp configured):
cnhngz01er01#sh voip rtp connections detail
VoIP RTP Port Usage Information:
Max Ports Available: 8091, Ports Reserved: 101, Ports in Use: 1
Port range not configured
Min Max Ports Ports Ports
Media-Address Range Port Port Available Reserved In-use
------------------------------------------------------------------------------
Global Media Pool 16384 32766 8091 101 1
------------------------------------------------------------------------------
VoIP RTP active connections :
No. CallId dstCallId LocalRTP RmtRTP LocalIP RemoteIP MPSS VRF
1 1208 1207 16464 24594 10.137.255.3 10.127.40.171 NO NA
callId 1208 (dir=2): called=4949 calling=0286161872700 redirect= loopback=NO confID=-1 mode=3 rtp(tx:124/rx:34228) rtcp(tx:136/rx:0) MPSS NO VRF NA peer callId 1207: called=26899249 calling=02161872700 redirect= , confID:0
, vrf = NA 1 context 0x2323C7F8 xmitFunc 0x35E87950
Found 1 active RTP connections
From the ip phone side I see the same amount of both received and transmitted packets.
I have tried (just in case) configure both sip and h323 between 2911 and CUCM - with the same result. The only difference I have noticed is that in case of SIP the amount of packets sent from the gateway to the ip phone is a bit lower, than in case of h323 (~17 vs ~130).
Sh run, sh inv and some debugs are enclosed.
I would appreciate any help on this.
Kind regards,
Andrew C.
