Asterisk SIP trunk to CUCM 11.5 with pjsip

[George Paxson]

 Much of the Asterisk information on the internet is old.  I looked at Asterisk again after about 10 years since the last time.

I needed an auto dialer for my CUCM 11.5 cluster.  Here is a working pjsip.conf for the SIP trunks and extensions.conf.

My cluster is E.164 with 8 digit alternate numbers.  CUCM standard SIP profile with SIP OPTIONS Ping enabled.  Non Secure SIP Trunk Profile with "Accept unsolicited notification" and "Accept replaces header"

pjsip.conf

[transport-udp]
type=transport
protocol=udp
bind=0.0.0.0

[CUCMTRUNK]
type=endpoint
context=sip-inbound
transport=transport-udp
disallow=all
allow=ulaw
identify_by=ip

[CUCM1](CUCMTRUNK)
aors=CUCM1

[CUCM1]
type=aor
contact=sip:10.1.1.20

[CUCM1]
type=identify
endpoint=CUCM1
match=10.1.1.20

[CUCM2](CUCMTRUNK)
aors=CUCM2

[CUCM2]
type=aor
contact=sip:10.1.1.21

[CUCM2]
type=identify
endpoint=CUCM2
match=10.1.1.21

[CUCM3](CUCMTRUNK)
aors=CUCM3

[CUCM3]
type=aor
contact=sip:10.2.2.3

[CUCM3]
type=identify
endpoint=CUCM3
match=10.2.2.3

extensions.conf

[sip-inbound]
include=asterisk-internal

[asterisk-internal]

exten=80013333,1,Answer()
same=n,Wait(1)
same=n,Playback(hello-world)
same=n,Hangup()

exten=_8XXXXXXX,1,Dial(PJSIP/${EXTEN}@CUCM3)
exten=_8XXXXXXX,2,Dial(PJSIP/${EXTEN}@CUCM2)
exten=_8XXXXXXX,3,Dial(PJSIP/${EXTEN}@CUCM1)

exten=_+.,1,Dial(PJSIP/${EXTEN}@CUCM3)
exten=_+.,2,Dial(PJSIP/${EXTEN}@CUCM2)
exten=_+.,3,Dial(PJSIP/${EXTEN}@CUCM1)

[AlexC00011]

This config saved my life! I have half of the problem solved. 

I am able to make calls from asterisk environment to a phone registered behind CUCM's trunk. However, I am not able to route incoming calls from cisco into asterisk. What am I missing?

Every time I place a call from the cisco side to an asterisk extension, I get the following traffic in asterisk server.

Call tone is "busy"

tcpdump -i any -nn port 5060
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on any, link-type LINUX_SLL (Linux cooked), capture size 262144 bytes

13:47:13.364668 IP 157.170.224.103.59869 > 10.180.69.241.5060: Flags [S], seq 3635636516, win 14600, options [mss 1460,sackOK,TS val 2555426310 ecr 0,nop,wscale 7], length 0
13:47:13.364729 IP 10.180.69.241.5060 > 157.170.224.103.59869: Flags [R.], seq 0, ack 3635636517, win 0, length 0

[George Paxson]

Alex:
I haven't looked at this in a while and might not be of much help. I would try to get the Asterisk "Hello World" script working as a start. I checked and still have a route pattern pointing to the Asterisk trunk. 80013333 Nothing special.
I was testing as an auto dialing solution.
Extensions.conf

[asterisk-internal]

exten=80013333,1,Answer()
same=n,Wait(1)
same=n,Playback(hello-world)
same=n,Hangup()

[SebastianV]

George, thanks for sharing! This was exactly what I needed to connect my CME to an intermediate Asterisk install to be able to connect multiple SIP trunks and annoy my girflriend with 'those bulky desktop phones' around the house.

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