[SR-Users] IMS Kamailio "477 Unfortunately error on sending to next hop occurred" code sent by the PCSCF

Sun Aug 23 16:36:02 CEST 2015

Hello everybody,

I have tried to perform a call between alice and bob (both registered in the same SCSCF and from the same PCSCF). The INVITE goes all the way as it is supposed:

Alice-->PCSCF-->SBC-->SCSCF-->ICSCF-->SCSCF-->SBC-->PCSCF.

But when it reaches PCSCF on Network to User direction, this SIP proxy answers with a "477 Unfortunately error on sending to next hop occurred" code just after an exchange with the RTP Proxy (Offer-Answer).

At kamailio.cfg (which it is not change from the default config) this exchange is done under Route[RTPRPROXY] in the function:

rtpengine_manage("trust-address replace-origin replace-session-connection ICE=remove");

Does anybody know why is complaining (see below) about the server on localhost while it is not configured so?

Here you can find the logs from PCSCF:

Aug 23 15:10:06 ims rtpengine[556]: [3D504184-55D9D43E00072478-7E0DE700] Received command 'offer' from 192.168.0.108:57522Aug 23 15:10:06 ims rtpengine[556]: [3D504184-55D9D43E00072478-7E0DE700] Creating new callAug 23 15:10:06 ims rtpengine[556]: [3D504184-55D9D43E00072478-7E0DE700] Replying to 'offer' from 192.168.0.108:57522Aug 23 15:10:06 ims /usr/sbin/kamailio[3313]: ERROR: *** cfgtrace:request_route=[RTPPROXY] c=[/etc/kamailio/pcscf/kamailio.cfg] l=813 a=2 n=returnAug 23 15:10:06 ims /usr/sbin/kamailio[3313]: ERROR: *** cfgtrace:request_route=[Term_Initial] c=[/etc/kamailio/pcscf/kamailio.cfg] l=1196 a=24 n=t_relayAug 23 15:10:06 ims /usr/sbin/kamailio[3313]: ERROR: <core> [udp_server.c:550]: udp_send(): sendto(sock,0x7f480e27ed70,1358,0,192.168.0.105:49284,16): Invalid argument(22)Aug 23 15:10:06 ims /usr/sbin/kamailio[3313]: CRITICAL: <core> [udp_server.c:555]: udp_send(): invalid sendtoparameters#012one possible reason is the server is bound to localhost and#012attempts to send to the net
Here you can find the configuration from RTP proxy (/etc/default/ngcp-rtpengine-daemon) and you can see that I am not listening the localhost port at "INTERFACES":

RUN_RTPENGINE=yes
LISTEN_TCP=25060LISTEN_UDP=12222LISTEN_NG=22222LISTEN_CLI=9900INTERFACES="192.168.0.108"TIMEOUT=60SILENT_TIMEOUT=3600PIDFILE=/var/run/ngcp-rtpengine-daemon.pidFORK=yes# TOS=184TABLE=0# NO_FALLBACK=yes# PORT_MIN=30000# PORT_MAX=50000# REDIS=127.0.0.1:6379# REDIS_DB=1# B2B_URL=http://127.0.0.1:8090/# LOG_LEVEL=6# LOG_FACILITY=daemon# LOG_FACILITY_CDR=daemon# LOG_FACILITY_RTCP=daemon# NUM_THREADS=5# DELETE_DELAY=30# GRAPHITE=9006# GRAPHITE_INTERVAL=60# GRAPHITE_PREFIX=myownprefix# MAX_SESSIONS=5000
And finally the pcscf.cfg:

# SIP / UDPlisten=udp:eth0:4060#listen=udp:127.0.0.1:4070listen=udp:127.0.0.1:4060# SIP / TCP (Monitoring)#listen=tcp:127.0.0.1:4060# SIP / TCP/TLS#listen=tls:109.239.57.200:5061# SIP / Websocket
#!define MY_WS_PORT 80
listen=tcp:eth0:MY_WS_PORT
# SIP / Websocket/TLS#!define MY_WSS_PORT 443#listen=tls:109.239.57.200:MY_WSS_PORT
#alias=pcscf-1.imscore.orgalias=pcscf.home-domain.net#alias=proxy.imscore.org#alias=tls:"wss-proxy.imscore.org":443
# Port, where we listen to Traffic#!define PORT 4060
# NUEVO Workshop!#!define SBCPORT 5080#!define PCSCF_URL "sip:pcscf.home-domain.net"#!define TCP_PROCESSES 32
#!subst "/NETWORKNAME/home-domain.net/"#!subst "/HOSTNAME/pcscf.home-domain.net/"#!define HOSTNAME_IP pcscf.home-domain.net#!define HOSTNAME_ESC "pcscf\.home-domain\.net"
# SIP-Address of capturing node, if not set, capturing is disabled.##!define CAPTURE_NODE "sip:10.1.8.55"
# Allowed IPs for XML-RPC-Queries#!define XMLRPC_WHITELIST_1 "127.0.0.1"##!define XMLRPC_WHITELIST_2 "127.0.0.1"##!define XMLRPC_WHITELIST_3 "127.0.0.1"
# Databases:#!define DB_URL "mysql://pcscf:heslo@127.0.0.1/pcscf"##!define DB_URL2 "con2=>mysql://pcscf:heslo@127.0.0.1/pcscf"##!define DB_URL "con1=>mysql://pcscf:heslo@192.168.5.1/pcscf"##!define DB_URL2 "con2=>mysql://pcscf:heslo@10.1.27.217/pcscf"
#! Optional: Server-URL for Websocket-Requests##!define WEBSOCKET_WEBSERVER "phone.imscore.org"
# NUEVO Workshop!#!subst "/ICID_VALUE_PREFIX/P-CSCFabcd/"#!subst "/ICID_GEN_ADDR/127.0.0.1/"
# IP-Adress(es) of the RTP-Proxy##!define RTPPROXY_ADDRESS "udp:10.1.2.186:22222 udp:10.1.27.217:22222"#!define RTPPROXY_ADDRESS "udp:192.168.0.108:22222"## Several features can be enabled using '#!define WITH_FEATURE' directives:## *** To run in debug mode:#     - define WITH_DEBUG## *** To enable nat traversal execute:#     - define WITH_NAT#     - define the connection to the RTP-Proxy: RTPPROXY_ADDRESS## *** To force alls calls through the RTP-Proxy#     - this will automagically enable NAT-Traversal#     - define FORCE_RTPRELAY## *** To enable IPv4/IPv6 Translation (RTPProxy)#     - this will automagically enable NAT-Traversal#     - define WITH_RTPIPV4## *** To enable TCP support execute:#     - define WITH_TCP## *** To enable TLS support execute:#     - adjust CFGDIR/tls.cfg as needed#     - define WITH_TLS#     - this will automagically enable TCP## *** To enable XMLRPC support execute:#     - define WITH_XMLRPC#     - this will automagically enable TCP## *** To enable anti-flood detection execute:#     - adjust pike and htable=>ipban settings as needed (default is#       block if more than 16 requests in 2 seconds and ban for 300 seconds)#     - define WITH_ANTIFLOOD## *** To enable the Rx-Interface:#     - Configure Rx-Diameter-Interface in pcscf.xml#     - define WITH_RX## *** To enable a Homer SIP-Capter-Node:#     - define CAPTURE_NODE with a proper address## *** To enable support for the SEMS-SBC#     - define WITH_SBC#     - configure dispatcher-list with a set of SBC's## *** To enable support for Websocket#     - define WITH_WEBSOCKET#     - this will automagically enable TCP## Enabled Features for this host:#!define WITH_DEBUG#!define WITH_NAT#!define WITH_NATPING#!define FORCE_RTPRELAY##!define WITH_TLS#!define WITH_XMLRPC#!define WITH_ANTIFLOOD##!define WITH_RX##!define WITH_RX_REG##!define WITH_RX_CALL##!define WITH_TCP##!define WITH_SBC##!define WITH_RTPIPV4#!define WITH_SBC_CALL#!define WITH_REGINFO#!define WITH_WEBSOCKET#!define WITH_IMS_HDR_CACHE
Thanks a lot for your attention

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