freeswitch隐藏fs标识

概述

freeswitch是一款好用的开源软交换平台。

fs的默认配置环境下，sip消息中有很多freeswitch的标识，比如“user-agent”，“contact”头域等等。

对于某些场景，我们希望隐藏掉这些有识别性的标识。

环境

centos：CentOS  release 7.0 (Final)或以上版本

freeswitch：v1.6.19

GCC：4.8.5

默认的invite消息

freeswitch默认的invite消息如下。

INVITE sip:10011@10.55.55.137:5080;user=phone SIP/2.0

Via: SIP/2.0/UDP 10.55.55.138:5080;rport;branch=z9hG4bKFrH7aXtvQyKSc

Max-Forwards: 66

From: "" <sip:10012@10.55.55.138>;tag=Z3gB0ygy8F4ep

To: <sip:10011@10.55.55.137:5080>

Call-ID: 2f8fa2b9-baa0-123b-d08b-0cc47a9bab4c

CSeq: 57675850 INVITE

Contact: <sip:mod_sofia@10.55.55.138:5080>

User-Agent: FreeSWITCH-mod_sofia/1.6.19~64bit

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

Supported: precondition, 100rel, timer, path, replaces

Allow-Events: talk, hold, conference, refer

Privacy: none

Content-Type: application/sdp

Content-Disposition: session

Content-Length: 218

X-FS-Support: update_display,send_info

P-Asserted-Identity: <sip:10012@10.55.55.138>

v=0

o=FreeSWITCH 1664417843 1664417844 IN IP4 10.55.55.138

s=FreeSWITCH

c=IN IP4 10.55.55.138

t=0 0

m=audio 41442 RTP/AVP 8 101

a=rtpmap:8 PCMA/8000

a=rtpmap:101 telephone-event/8000

a=fmtp:101 0-16

a=ptime:20

其中，有3个地方需要修改。

Contact: <sip:mod_sofia@10.55.55.138:5080>

User-Agent: FreeSWITCH-mod_sofia/1.8.7~64bit

o=FreeSWITCH 1664417843 1664417844 IN IP4 10.55.55.138

s=FreeSWITCH

配置

修改配置文件conf/sip_profile/external.xml。影响头域“User-Agent”和SDP信息。

<param name="user-agent-string" value="sbc001"/>

<param name="username" value="sbc001"/>

修改配置文件conf/dialplan/test01.xml。影响头域“Contact”。

<X-PRE-PROCESS cmd="set" data="sip_contact_user=SBC001"/>

修正后的invite消息

配置后重启fs，修正后的invite消息如下。

INVITE sip:10011@10.55.55.137:5080;user=phone SIP/2.0

Via: SIP/2.0/UDP 10.55.55.138:5080;rport;branch=z9hG4bKQBg4gFvQKXKUK

Max-Forwards: 57

From: "" <sip:10012@10.55.55.138>;tag=j26Bv08Ne8a5D

To: <sip:10011@10.55.55.137:5080>

Call-ID: e3d32a8e-c008-123b-df8b-0cc47a9bab4c

CSeq: 57973213 INVITE

Contact: <sip:SBC001@10.55.55.138:5080>

User-Agent: sbc001

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

Supported: precondition, 100rel, timer, path, replaces

Allow-Events: talk, hold, conference, refer

Privacy: none

Content-Type: application/sdp

Content-Disposition: session

Content-Length: 236

X-FS-Support: update_display,send_info

P-Asserted-Identity: <sip:10012@10.55.55.138>

v=0

o=sbc001 1665013537 1665013538 IN IP4 10.55.55.138

s=sbc001

c=IN IP4 10.55.55.138

t=0 0

m=audio 40474 RTP/AVP 8 18 101

a=rtpmap:8 PCMA/8000

a=rtpmap:18 G729/8000

a=rtpmap:101 telephone-event/8000

a=fmtp:101 0-16

a=ptime:20

影响到的头域包括。

Contact: <sip:SBC001@10.55.55.138:5080>

User-Agent: sbc001

o=sbc001 1665013537 1665013538 IN IP4 10.55.55.138

s=sbc001

总结

freeswitch的模块化和配置项非常多，初期学习比较困难，首先要学会查找文档资料，配置一个测试环境，随时测试。

遗留问题，“X-FS-Support”头域。

空空如常

求真得真